diff --git a/Marlin/example_configurations/AlephObjects/TAZ4/Configuration.h b/Marlin/example_configurations/AlephObjects/TAZ4/Configuration.h
index 2d78deea0c..3e4881f184 100644
--- a/Marlin/example_configurations/AlephObjects/TAZ4/Configuration.h
+++ b/Marlin/example_configurations/AlephObjects/TAZ4/Configuration.h
@@ -850,15 +850,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/AliExpress/CL-260/Configuration.h b/Marlin/example_configurations/AliExpress/CL-260/Configuration.h
index 5556955508..eb7143799c 100644
--- a/Marlin/example_configurations/AliExpress/CL-260/Configuration.h
+++ b/Marlin/example_configurations/AliExpress/CL-260/Configuration.h
@@ -830,15 +830,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Anet/A6/Configuration.h b/Marlin/example_configurations/Anet/A6/Configuration.h
index 0a2e7acfb1..d8c55ddf52 100644
--- a/Marlin/example_configurations/Anet/A6/Configuration.h
+++ b/Marlin/example_configurations/Anet/A6/Configuration.h
@@ -940,15 +940,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Anet/A8/Configuration.h b/Marlin/example_configurations/Anet/A8/Configuration.h
index 5e055c0d70..ac5bfc822d 100644
--- a/Marlin/example_configurations/Anet/A8/Configuration.h
+++ b/Marlin/example_configurations/Anet/A8/Configuration.h
@@ -837,15 +837,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/BIBO/TouchX/Cyclops/Configuration.h b/Marlin/example_configurations/BIBO/TouchX/Cyclops/Configuration.h
index 25fb41c2e9..8b1623f0b5 100644
--- a/Marlin/example_configurations/BIBO/TouchX/Cyclops/Configuration.h
+++ b/Marlin/example_configurations/BIBO/TouchX/Cyclops/Configuration.h
@@ -830,15 +830,16 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/BIBO/TouchX/default/Configuration.h b/Marlin/example_configurations/BIBO/TouchX/default/Configuration.h
index c37388a882..f1273327fa 100644
--- a/Marlin/example_configurations/BIBO/TouchX/default/Configuration.h
+++ b/Marlin/example_configurations/BIBO/TouchX/default/Configuration.h
@@ -830,15 +830,16 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/BQ/Hephestos/Configuration.h b/Marlin/example_configurations/BQ/Hephestos/Configuration.h
index 0c2baf52f7..f5923e1835 100644
--- a/Marlin/example_configurations/BQ/Hephestos/Configuration.h
+++ b/Marlin/example_configurations/BQ/Hephestos/Configuration.h
@@ -818,15 +818,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/BQ/Hephestos_2/Configuration.h b/Marlin/example_configurations/BQ/Hephestos_2/Configuration.h
index cb401cbbd7..e7893ef30d 100644
--- a/Marlin/example_configurations/BQ/Hephestos_2/Configuration.h
+++ b/Marlin/example_configurations/BQ/Hephestos_2/Configuration.h
@@ -831,15 +831,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/BQ/WITBOX/Configuration.h b/Marlin/example_configurations/BQ/WITBOX/Configuration.h
index d482d0edcb..00ec791b86 100644
--- a/Marlin/example_configurations/BQ/WITBOX/Configuration.h
+++ b/Marlin/example_configurations/BQ/WITBOX/Configuration.h
@@ -818,15 +818,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Cartesio/Configuration.h b/Marlin/example_configurations/Cartesio/Configuration.h
index d5d7b73bbd..a555607ac8 100644
--- a/Marlin/example_configurations/Cartesio/Configuration.h
+++ b/Marlin/example_configurations/Cartesio/Configuration.h
@@ -829,15 +829,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Creality/CR-10/Configuration.h b/Marlin/example_configurations/Creality/CR-10/Configuration.h
index 8f81925ef8..228e79f5fb 100755
--- a/Marlin/example_configurations/Creality/CR-10/Configuration.h
+++ b/Marlin/example_configurations/Creality/CR-10/Configuration.h
@@ -840,15 +840,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Creality/CR-10S/Configuration.h b/Marlin/example_configurations/Creality/CR-10S/Configuration.h
index d2cb86001f..58212edde4 100644
--- a/Marlin/example_configurations/Creality/CR-10S/Configuration.h
+++ b/Marlin/example_configurations/Creality/CR-10S/Configuration.h
@@ -829,15 +829,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 #define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING true // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Creality/Ender/Configuration.h b/Marlin/example_configurations/Creality/Ender/Configuration.h
index 4e722c0aba..2c9b6570cf 100644
--- a/Marlin/example_configurations/Creality/Ender/Configuration.h
+++ b/Marlin/example_configurations/Creality/Ender/Configuration.h
@@ -833,15 +833,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Felix/Configuration.h b/Marlin/example_configurations/Felix/Configuration.h
index 89401fed02..5b4ffdd826 100644
--- a/Marlin/example_configurations/Felix/Configuration.h
+++ b/Marlin/example_configurations/Felix/Configuration.h
@@ -812,15 +812,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Felix/DUAL/Configuration.h b/Marlin/example_configurations/Felix/DUAL/Configuration.h
index 0b4d46ae4f..66bcde42c8 100644
--- a/Marlin/example_configurations/Felix/DUAL/Configuration.h
+++ b/Marlin/example_configurations/Felix/DUAL/Configuration.h
@@ -812,15 +812,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/FolgerTech/i3-2020/Configuration.h b/Marlin/example_configurations/FolgerTech/i3-2020/Configuration.h
index 6d57a96ca5..1e1392592f 100644
--- a/Marlin/example_configurations/FolgerTech/i3-2020/Configuration.h
+++ b/Marlin/example_configurations/FolgerTech/i3-2020/Configuration.h
@@ -844,15 +844,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Geeetech/GT2560/Configuration.h b/Marlin/example_configurations/Geeetech/GT2560/Configuration.h
index 86da9edb31..8ecb8062f8 100644
--- a/Marlin/example_configurations/Geeetech/GT2560/Configuration.h
+++ b/Marlin/example_configurations/Geeetech/GT2560/Configuration.h
@@ -845,15 +845,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Geeetech/I3_Pro_X-GT2560/Configuration.h b/Marlin/example_configurations/Geeetech/I3_Pro_X-GT2560/Configuration.h
index 96e8db13ca..92092a8e89 100644
--- a/Marlin/example_configurations/Geeetech/I3_Pro_X-GT2560/Configuration.h
+++ b/Marlin/example_configurations/Geeetech/I3_Pro_X-GT2560/Configuration.h
@@ -830,15 +830,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/bltouch/Configuration.h b/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/bltouch/Configuration.h
index 9c102ca592..ba9f196a24 100644
--- a/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/bltouch/Configuration.h	
+++ b/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/bltouch/Configuration.h	
@@ -837,15 +837,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/noprobe/Configuration.h b/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/noprobe/Configuration.h
index 0330a5ba29..f0f611fefe 100644
--- a/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/noprobe/Configuration.h	
+++ b/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/noprobe/Configuration.h	
@@ -836,15 +836,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Infitary/i3-M508/Configuration.h b/Marlin/example_configurations/Infitary/i3-M508/Configuration.h
index 1da1845cc1..329c8ebb30 100644
--- a/Marlin/example_configurations/Infitary/i3-M508/Configuration.h
+++ b/Marlin/example_configurations/Infitary/i3-M508/Configuration.h
@@ -834,15 +834,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/JGAurora/A5/Configuration.h b/Marlin/example_configurations/JGAurora/A5/Configuration.h
index 9eba4aff4b..41c3ff9032 100644
--- a/Marlin/example_configurations/JGAurora/A5/Configuration.h
+++ b/Marlin/example_configurations/JGAurora/A5/Configuration.h
@@ -842,15 +842,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 #define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Malyan/M150/Configuration.h b/Marlin/example_configurations/Malyan/M150/Configuration.h
index 046909b7fe..5ca9a0e893 100644
--- a/Marlin/example_configurations/Malyan/M150/Configuration.h
+++ b/Marlin/example_configurations/Malyan/M150/Configuration.h
@@ -854,15 +854,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Micromake/C1/basic/Configuration.h b/Marlin/example_configurations/Micromake/C1/basic/Configuration.h
index a79fafe2f4..61c3c66c82 100644
--- a/Marlin/example_configurations/Micromake/C1/basic/Configuration.h
+++ b/Marlin/example_configurations/Micromake/C1/basic/Configuration.h
@@ -834,15 +834,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Micromake/C1/enhanced/Configuration.h b/Marlin/example_configurations/Micromake/C1/enhanced/Configuration.h
index 5c9a869af7..831999c89b 100644
--- a/Marlin/example_configurations/Micromake/C1/enhanced/Configuration.h
+++ b/Marlin/example_configurations/Micromake/C1/enhanced/Configuration.h
@@ -834,15 +834,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
index 1b358029d7..77bfe52f23 100644
--- a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
+++ b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
@@ -830,15 +830,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/RigidBot/Configuration.h b/Marlin/example_configurations/RigidBot/Configuration.h
index fc59e2f475..669b0bf2c6 100644
--- a/Marlin/example_configurations/RigidBot/Configuration.h
+++ b/Marlin/example_configurations/RigidBot/Configuration.h
@@ -828,15 +828,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/SCARA/Configuration.h b/Marlin/example_configurations/SCARA/Configuration.h
index fb0e46c730..b6be86fc85 100644
--- a/Marlin/example_configurations/SCARA/Configuration.h
+++ b/Marlin/example_configurations/SCARA/Configuration.h
@@ -842,15 +842,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Sanguinololu/Configuration.h b/Marlin/example_configurations/Sanguinololu/Configuration.h
index d5eba82494..4f9cd49051 100644
--- a/Marlin/example_configurations/Sanguinololu/Configuration.h
+++ b/Marlin/example_configurations/Sanguinololu/Configuration.h
@@ -861,15 +861,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/TinyBoy2/Configuration.h b/Marlin/example_configurations/TinyBoy2/Configuration.h
index 3b8b9421f6..3a3ab76c7c 100644
--- a/Marlin/example_configurations/TinyBoy2/Configuration.h
+++ b/Marlin/example_configurations/TinyBoy2/Configuration.h
@@ -886,15 +886,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Tronxy/X1/Configuration.h b/Marlin/example_configurations/Tronxy/X1/Configuration.h
index a2d210e579..53281b71f6 100644
--- a/Marlin/example_configurations/Tronxy/X1/Configuration.h
+++ b/Marlin/example_configurations/Tronxy/X1/Configuration.h
@@ -829,15 +829,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Tronxy/X5S/Configuration.h b/Marlin/example_configurations/Tronxy/X5S/Configuration.h
index 90b94b1dbf..8ab57b4547 100644
--- a/Marlin/example_configurations/Tronxy/X5S/Configuration.h
+++ b/Marlin/example_configurations/Tronxy/X5S/Configuration.h
@@ -830,15 +830,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Tronxy/XY100/Configuration.h b/Marlin/example_configurations/Tronxy/XY100/Configuration.h
index fb19fe7f57..809641281b 100644
--- a/Marlin/example_configurations/Tronxy/XY100/Configuration.h
+++ b/Marlin/example_configurations/Tronxy/XY100/Configuration.h
@@ -841,15 +841,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Velleman/K8200/Configuration.h b/Marlin/example_configurations/Velleman/K8200/Configuration.h
index 3f41ff9571..bfd0500e0e 100644
--- a/Marlin/example_configurations/Velleman/K8200/Configuration.h
+++ b/Marlin/example_configurations/Velleman/K8200/Configuration.h
@@ -860,15 +860,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Velleman/K8400/Configuration.h b/Marlin/example_configurations/Velleman/K8400/Configuration.h
index f8f85e30e2..5a7f0eb5b7 100644
--- a/Marlin/example_configurations/Velleman/K8400/Configuration.h
+++ b/Marlin/example_configurations/Velleman/K8400/Configuration.h
@@ -830,15 +830,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Velleman/K8400/Dual-head/Configuration.h b/Marlin/example_configurations/Velleman/K8400/Dual-head/Configuration.h
index 96888127a3..175587ed1b 100644
--- a/Marlin/example_configurations/Velleman/K8400/Dual-head/Configuration.h
+++ b/Marlin/example_configurations/Velleman/K8400/Dual-head/Configuration.h
@@ -830,15 +830,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/Wanhao/Duplicator 6/Configuration.h b/Marlin/example_configurations/Wanhao/Duplicator 6/Configuration.h
index 4bfd1f7ebf..565d6988f3 100644
--- a/Marlin/example_configurations/Wanhao/Duplicator 6/Configuration.h	
+++ b/Marlin/example_configurations/Wanhao/Duplicator 6/Configuration.h	
@@ -840,15 +840,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/adafruit/ST7565/Configuration.h b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
index b518ca7736..fcb90d26c8 100644
--- a/Marlin/example_configurations/adafruit/ST7565/Configuration.h
+++ b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
@@ -830,15 +830,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration.h b/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration.h
index 433ba1ffa7..ae700d94b6 100644
--- a/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration.h
+++ b/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration.h
@@ -960,15 +960,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/delta/FLSUN/kossel/Configuration.h b/Marlin/example_configurations/delta/FLSUN/kossel/Configuration.h
index 78a0bedb54..b9192807da 100644
--- a/Marlin/example_configurations/delta/FLSUN/kossel/Configuration.h
+++ b/Marlin/example_configurations/delta/FLSUN/kossel/Configuration.h
@@ -959,15 +959,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration.h b/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration.h
index 49893eb1d3..79b68dee46 100644
--- a/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration.h
+++ b/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration.h
@@ -960,15 +960,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/delta/generic/Configuration.h b/Marlin/example_configurations/delta/generic/Configuration.h
index c067e4c54e..21036e8bcc 100644
--- a/Marlin/example_configurations/delta/generic/Configuration.h
+++ b/Marlin/example_configurations/delta/generic/Configuration.h
@@ -947,15 +947,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration.h b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
index a3213234c7..b9c85f80f0 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
@@ -950,15 +950,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/delta/kossel_pro/Configuration.h b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
index 4dfce8d37e..6eeb9458f9 100644
--- a/Marlin/example_configurations/delta/kossel_pro/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
@@ -950,15 +950,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/delta/kossel_xl/Configuration.h b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
index 9d1097e389..2bf47323c2 100644
--- a/Marlin/example_configurations/delta/kossel_xl/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
@@ -959,15 +959,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/gCreate/gMax1.5+/Configuration.h b/Marlin/example_configurations/gCreate/gMax1.5+/Configuration.h
index 81ab93d24d..dad67f8d90 100644
--- a/Marlin/example_configurations/gCreate/gMax1.5+/Configuration.h
+++ b/Marlin/example_configurations/gCreate/gMax1.5+/Configuration.h
@@ -844,15 +844,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 #define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/makibox/Configuration.h b/Marlin/example_configurations/makibox/Configuration.h
index 5707693db6..e23f7f032f 100644
--- a/Marlin/example_configurations/makibox/Configuration.h
+++ b/Marlin/example_configurations/makibox/Configuration.h
@@ -833,15 +833,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration.h b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
index eaf26d0df9..2058d80910 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
@@ -825,15 +825,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
diff --git a/Marlin/example_configurations/wt150/Configuration.h b/Marlin/example_configurations/wt150/Configuration.h
index e86cd2d795..e05b03e649 100644
--- a/Marlin/example_configurations/wt150/Configuration.h
+++ b/Marlin/example_configurations/wt150/Configuration.h
@@ -835,15 +835,16 @@
 #endif
 
 /**
- * Filament Runout Sensor
- * A mechanical or opto endstop is used to check for the presence of filament.
+ * Filament Runout Sensors
+ * Mechanical or opto endstops are used to check for the presence of filament.
  *
- * RAMPS-based boards use SERVO3_PIN.
- * For other boards you may need to define FIL_RUNOUT_PIN.
- * By default the firmware assumes HIGH = has filament, LOW = ran out
+ * RAMPS-based boards use SERVO3_PIN for the first runout sensor.
+ * For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
+ * By default the firmware assumes HIGH=FILAMENT PRESENT.
  */
 //#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  #define NUM_RUNOUT_SENSORS   1     // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   #define FILAMENT_RUNOUT_SCRIPT "M600"