🔧 FT Motion Linear Advance K factor nnnn.nn (#27416)

Lost part of #26785

Author: narno2202

Marlin/Configuration_adv.h

@@ -1135,7 +1135,7 @@
   #define FTM_SHAPING_DEFAULT_FREQ_X   37.0f      // (Hz) Default peak frequency used by input shapers
   #define FTM_SHAPING_DEFAULT_FREQ_Y   37.0f      // (Hz) Default peak frequency used by input shapers
   #define FTM_LINEAR_ADV_DEFAULT_ENA   false      // Default linear advance enable (true) or disable (false)
-  #define FTM_LINEAR_ADV_DEFAULT_K      0         // Default linear advance gain, integer value. (Acceleration-based scaling factor.)
+  #define FTM_LINEAR_ADV_DEFAULT_K      0.0f      // Default linear advance gain. (Acceleration-based scaling factor.)
   #define FTM_SHAPING_ZETA_X            0.1f      // Zeta used by input shapers for X axis
   #define FTM_SHAPING_ZETA_Y            0.1f      // Zeta used by input shapers for Y axis
 

Marlin/src/lcd/menu/menu_motion.cpp

@@ -464,7 +464,7 @@ void menu_move() {
       #if HAS_EXTRUDERS
         EDIT_ITEM(bool, MSG_LINEAR_ADVANCE, &c.linearAdvEna);
         if (c.linearAdvEna || ENABLED(FT_MOTION_NO_MENU_TOGGLE))
-          EDIT_ITEM(float42_52, MSG_ADVANCE_K, &c.linearAdvK, 0, 10);
+          EDIT_ITEM(float62, MSG_ADVANCE_K, &c.linearAdvK, 0.0f, 1000.0f);
       #endif
     }
     END_MENU();

Marlin/src/module/ft_motion.cpp

@@ -607,7 +607,7 @@ void FTMotion::makeVector() {
   #if HAS_EXTRUDERS
     if (cfg.linearAdvEna) {
       float dedt_adj = (traj.e[makeVector_batchIdx] - e_raw_z1) * (FTM_FS);
-      if (ratio.e > 0.0f) dedt_adj += accel_k * cfg.linearAdvK;
+      if (ratio.e > 0.0f) dedt_adj += accel_k * cfg.linearAdvK * 0.0001f;
 
       e_raw_z1 = traj.e[makeVector_batchIdx];
       e_advanced_z1 += dedt_adj * (FTM_TS);