From 733209f9a2cfa347e072738c76860c08a4e74500 Mon Sep 17 00:00:00 2001
From: Keith Bennett <13375512+thisiskeithb@users.noreply.github.com>
Date: Sun, 18 Jun 2023 22:12:50 -0700
Subject: [PATCH] =?UTF-8?q?=F0=9F=94=A7=20MPC=20adjustments=20(#25986)?=
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---
 Marlin/Configuration.h | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index b905b24688..b573d2d9ec 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -686,13 +686,13 @@
 /**
  * Model Predictive Control for hotend
  *
- * Use a physical model of the hotend to control temperature. When configured correctly
- * this gives better responsiveness and stability than PID and it also removes the need
- * for PID_EXTRUSION_SCALING and PID_FAN_SCALING. Use M306 T to autotune the model.
+ * Use a physical model of the hotend to control temperature. When configured correctly this gives
+ * better responsiveness and stability than PID and removes the need for PID_EXTRUSION_SCALING
+ * and PID_FAN_SCALING. Enable MPC_AUTOTUNE and use M306 T to autotune the model.
  * @section mpctemp
  */
 #if ENABLED(MPCTEMP)
-  //#define MPC_AUTOTUNE                              // Include a method to do MPC auto-tuning (~6.3K bytes of flash)
+  #define MPC_AUTOTUNE                                // Include a method to do MPC auto-tuning (~6.3K bytes of flash)
   //#define MPC_EDIT_MENU                             // Add MPC editing to the "Advanced Settings" menu. (~1.3K bytes of flash)
   //#define MPC_AUTOTUNE_MENU                         // Add MPC auto-tuning to the "Advanced Settings" menu. (~350 bytes of flash)
 
@@ -715,8 +715,12 @@
     //#define MPC_FAN_0_ACTIVE_HOTEND
   #endif
 
+  // Filament Heat Capacity (joules/kelvin/mm)
+  // Set at runtime with M306 H<value>
   #define FILAMENT_HEAT_CAPACITY_PERMM { 5.6e-3f }    // 0.0056 J/K/mm for 1.75mm PLA (0.0149 J/K/mm for 2.85mm PLA).
-  //#define FILAMENT_HEAT_CAPACITY_PERMM { 3.6e-3f }  // 0.0036 J/K/mm for 1.75mm PETG (0.0094 J/K/mm for 2.85mm PETG).
+                                                      // 0.0036 J/K/mm for 1.75mm PETG (0.0094 J/K/mm for 2.85mm PETG).
+                                                      // 0.00515 J/K/mm for 1.75mm ABS (0.0137 J/K/mm for 2.85mm ABS).
+                                                      // 0.00522 J/K/mm for 1.75mm Nylon (0.0138 J/K/mm for 2.85mm Nylon).
 
   // Advanced options
   #define MPC_SMOOTHING_FACTOR 0.5f                   // (0.0...1.0) Noisy temperature sensors may need a lower value for stabilization.