Add Filament Change accelerations

Marlin/Configuration_adv.h

  */
 //#define ADVANCED_PAUSE_FEATURE
 #if ENABLED(ADVANCED_PAUSE_FEATURE)
-  #define PAUSE_PARK_RETRACT_FEEDRATE 60      // (mm/s) Initial retract feedrate.
-  #define PAUSE_PARK_RETRACT_LENGTH 2         // (mm) Initial retract.
-                                              // This short retract is done immediately, before parking the nozzle.
-  #define FILAMENT_CHANGE_UNLOAD_FEEDRATE 10  // (mm/s) Unload filament feedrate. This can be pretty fast.
-  #define FILAMENT_CHANGE_UNLOAD_LENGTH 100   // (mm) The length of filament for a complete unload.
-                                              //   For Bowden, the full length of the tube and nozzle.
-                                              //   For direct drive, the full length of the nozzle.
-                                              //   Set to 0 for manual unloading.
-  #define FILAMENT_CHANGE_LOAD_FEEDRATE 6     // (mm/s) Load filament feedrate. This can be pretty fast.
-  #define FILAMENT_CHANGE_LOAD_LENGTH 0       // (mm) Load length of filament, from extruder gear to nozzle.
-                                              //   For Bowden, the full length of the tube and nozzle.
-                                              //   For direct drive, the full length of the nozzle.
-  #define ADVANCED_PAUSE_EXTRUDE_FEEDRATE 3   // (mm/s) Extrude feedrate (after loading). Should be slower than load feedrate.
-  #define ADVANCED_PAUSE_EXTRUDE_LENGTH 50    // (mm) Length to extrude after loading.
-                                              //   Set to 0 for manual extrusion.
-                                              //   Filament can be extruded repeatedly from the Filament Change menu
-                                              //   until extrusion is consistent, and to purge old filament.
-
-                                              // Filament Unload does a Retract, Delay, and Purge first:
-  #define FILAMENT_UNLOAD_RETRACT_LENGTH 13   // (mm) Unload initial retract length.
-  #define FILAMENT_UNLOAD_DELAY 5000          // (ms) Delay for the filament to cool after retract.
-  #define FILAMENT_UNLOAD_PURGE_LENGTH 8      // (mm) An unretract is done, then this length is purged.
-  //#define ADVANCED_PAUSE_CONTINUOUS_PURGE   // Purge continuously up to the purge length until interrupted.
-
-  #define PAUSE_PARK_NOZZLE_TIMEOUT 45        // (seconds) Time limit before the nozzle is turned off for safety.
-  #define FILAMENT_CHANGE_ALERT_BEEPS 10      // Number of alert beeps to play when a response is needed.
-  #define PAUSE_PARK_NO_STEPPER_TIMEOUT       // Enable for XYZ steppers to stay powered on during filament change.
-
-  //#define PARK_HEAD_ON_PAUSE                // Park the nozzle during pause and filament change.
-  //#define HOME_BEFORE_FILAMENT_CHANGE       // Ensure homing has been completed prior to parking for filament change
-
-  //#define FILAMENT_LOAD_UNLOAD_GCODES       // Add M701/M702 Load/Unload G-codes, plus Load/Unload in the LCD Prepare menu.
-  //#define FILAMENT_UNLOAD_ALL_EXTRUDERS     // Allow M702 to unload all extruders above a minimum target temp (as set by M302)
+  #define PAUSE_PARK_RETRACT_FEEDRATE         60  // (mm/s) Initial retract feedrate.
+  #define PAUSE_PARK_RETRACT_LENGTH            2  // (mm) Initial retract.
+                                                  // This short retract is done immediately, before parking the nozzle.
+  #define FILAMENT_CHANGE_UNLOAD_FEEDRATE     10  // (mm/s) Unload filament feedrate. This can be pretty fast.
+  #define FILAMENT_CHANGE_UNLOAD_ACCEL        25  // (mm/s^2) Lower acceleration may allow a faster feedrate.
+  #define FILAMENT_CHANGE_UNLOAD_LENGTH      100  // (mm) The length of filament for a complete unload.
+                                                  //   For Bowden, the full length of the tube and nozzle.
+                                                  //   For direct drive, the full length of the nozzle.
+                                                  //   Set to 0 for manual unloading.
+  #define FILAMENT_CHANGE_SLOW_LOAD_FEEDRATE   6  // (mm/s) Slow move when starting load.
+  #define FILAMENT_CHANGE_SLOW_LOAD_LENGTH     0  // (mm) Slow length, to allow time to insert material.
+                                                  // 0 to disable start loading and skip to fast load only
+  #define FILAMENT_CHANGE_FAST_LOAD_FEEDRATE   6  // (mm/s) Load filament feedrate. This can be pretty fast.
+  #define FILAMENT_CHANGE_FAST_LOAD_ACCEL     25  // (mm/s^2) Lower acceleration may allow a faster feedrate.
+  #define FILAMENT_CHANGE_FAST_LOAD_LENGTH     0  // (mm) Load length of filament, from extruder gear to nozzle.
+                                                  //   For Bowden, the full length of the tube and nozzle.
+                                                  //   For direct drive, the full length of the nozzle.
+  //#define ADVANCED_PAUSE_CONTINUOUS_PURGE       // Purge continuously up to the purge length until interrupted.
+  #define ADVANCED_PAUSE_PURGE_FEEDRATE        3  // (mm/s) Extrude feedrate (after loading). Should be slower than load feedrate.
+  #define ADVANCED_PAUSE_PURGE_LENGTH         50  // (mm) Length to extrude after loading.
+                                                  //   Set to 0 for manual extrusion.
+                                                  //   Filament can be extruded repeatedly from the Filament Change menu
+                                                  //   until extrusion is consistent, and to purge old filament.
+
+                                                  // Filament Unload does a Retract, Delay, and Purge first:
+  #define FILAMENT_UNLOAD_RETRACT_LENGTH      13  // (mm) Unload initial retract length.
+  #define FILAMENT_UNLOAD_DELAY             5000  // (ms) Delay for the filament to cool after retract.
+  #define FILAMENT_UNLOAD_PURGE_LENGTH         8  // (mm) An unretract is done, then this length is purged.
+
+  #define PAUSE_PARK_NOZZLE_TIMEOUT           45  // (seconds) Time limit before the nozzle is turned off for safety.
+  #define FILAMENT_CHANGE_ALERT_BEEPS         10  // Number of alert beeps to play when a response is needed.
+  #define PAUSE_PARK_NO_STEPPER_TIMEOUT           // Enable for XYZ steppers to stay powered on during filament change.
+
+  //#define PARK_HEAD_ON_PAUSE                    // Park the nozzle during pause and filament change.
+  //#define HOME_BEFORE_FILAMENT_CHANGE           // Ensure homing has been completed prior to parking for filament change
+
+  //#define FILAMENT_LOAD_UNLOAD_GCODES           // Add M701/M702 Load/Unload G-codes, plus Load/Unload in the LCD Prepare menu.
+  //#define FILAMENT_UNLOAD_ALL_EXTRUDERS         // Allow M702 to unload all extruders above a minimum target temp (as set by M302)
 #endif
 
 // @section tmc

Marlin/src/config/default/Configuration_adv.h

  */
 //#define ADVANCED_PAUSE_FEATURE
 #if ENABLED(ADVANCED_PAUSE_FEATURE)
-  #define PAUSE_PARK_RETRACT_FEEDRATE 60      // (mm/s) Initial retract feedrate.
-  #define PAUSE_PARK_RETRACT_LENGTH 2         // (mm) Initial retract.
-                                              // This short retract is done immediately, before parking the nozzle.
-  #define FILAMENT_CHANGE_UNLOAD_FEEDRATE 10  // (mm/s) Unload filament feedrate. This can be pretty fast.
-  #define FILAMENT_CHANGE_UNLOAD_LENGTH 100   // (mm) The length of filament for a complete unload.
-                                              //   For Bowden, the full length of the tube and nozzle.
-                                              //   For direct drive, the full length of the nozzle.
-                                              //   Set to 0 for manual unloading.
-  #define FILAMENT_CHANGE_LOAD_FEEDRATE 6     // (mm/s) Load filament feedrate. This can be pretty fast.
-  #define FILAMENT_CHANGE_LOAD_LENGTH 0       // (mm) Load length of filament, from extruder gear to nozzle.
-                                              //   For Bowden, the full length of the tube and nozzle.
-                                              //   For direct drive, the full length of the nozzle.
-  #define ADVANCED_PAUSE_EXTRUDE_FEEDRATE 3   // (mm/s) Extrude feedrate (after loading). Should be slower than load feedrate.
-  #define ADVANCED_PAUSE_EXTRUDE_LENGTH 50    // (mm) Length to extrude after loading.
-                                              //   Set to 0 for manual extrusion.
-                                              //   Filament can be extruded repeatedly from the Filament Change menu
-                                              //   until extrusion is consistent, and to purge old filament.
-
-                                              // Filament Unload does a Retract, Delay, and Purge first:
-  #define FILAMENT_UNLOAD_RETRACT_LENGTH 13   // (mm) Unload initial retract length.
-  #define FILAMENT_UNLOAD_DELAY 5000          // (ms) Delay for the filament to cool after retract.
-  #define FILAMENT_UNLOAD_PURGE_LENGTH 8      // (mm) An unretract is done, then this length is purged.
-  //#define ADVANCED_PAUSE_CONTINUOUS_PURGE   // Purge continuously up to the purge length until interrupted.
-
-  #define PAUSE_PARK_NOZZLE_TIMEOUT 45        // (seconds) Time limit before the nozzle is turned off for safety.
-  #define FILAMENT_CHANGE_ALERT_BEEPS 10      // Number of alert beeps to play when a response is needed.
-  #define PAUSE_PARK_NO_STEPPER_TIMEOUT       // Enable for XYZ steppers to stay powered on during filament change.
-
-  //#define PARK_HEAD_ON_PAUSE                // Park the nozzle during pause and filament change.
-  //#define HOME_BEFORE_FILAMENT_CHANGE       // Ensure homing has been completed prior to parking for filament change
-
-  //#define FILAMENT_LOAD_UNLOAD_GCODES       // Add M701/M702 Load/Unload G-codes, plus Load/Unload in the LCD Prepare menu.
-  //#define FILAMENT_UNLOAD_ALL_EXTRUDERS     // Allow M702 to unload all extruders above a minimum target temp (as set by M302)
+  #define PAUSE_PARK_RETRACT_FEEDRATE         60  // (mm/s) Initial retract feedrate.
+  #define PAUSE_PARK_RETRACT_LENGTH            2  // (mm) Initial retract.
+                                                  // This short retract is done immediately, before parking the nozzle.
+  #define FILAMENT_CHANGE_UNLOAD_FEEDRATE     10  // (mm/s) Unload filament feedrate. This can be pretty fast.
+  #define FILAMENT_CHANGE_UNLOAD_ACCEL        25  // (mm/s^2) Lower acceleration may allow a faster feedrate.
+  #define FILAMENT_CHANGE_UNLOAD_LENGTH      100  // (mm) The length of filament for a complete unload.
+                                                  //   For Bowden, the full length of the tube and nozzle.
+                                                  //   For direct drive, the full length of the nozzle.
+                                                  //   Set to 0 for manual unloading.
+  #define FILAMENT_CHANGE_SLOW_LOAD_FEEDRATE   6  // (mm/s) Slow move when starting load.
+  #define FILAMENT_CHANGE_SLOW_LOAD_LENGTH     0  // (mm) Slow length, to allow time to insert material.
+                                                  // 0 to disable start loading and skip to fast load only
+  #define FILAMENT_CHANGE_FAST_LOAD_FEEDRATE   6  // (mm/s) Load filament feedrate. This can be pretty fast.
+  #define FILAMENT_CHANGE_FAST_LOAD_ACCEL     25  // (mm/s^2) Lower acceleration may allow a faster feedrate.
+  #define FILAMENT_CHANGE_FAST_LOAD_LENGTH     0  // (mm) Load length of filament, from extruder gear to nozzle.
+                                                  //   For Bowden, the full length of the tube and nozzle.
+                                                  //   For direct drive, the full length of the nozzle.
+  //#define ADVANCED_PAUSE_CONTINUOUS_PURGE       // Purge continuously up to the purge length until interrupted.
+  #define ADVANCED_PAUSE_PURGE_FEEDRATE        3  // (mm/s) Extrude feedrate (after loading). Should be slower than load feedrate.
+  #define ADVANCED_PAUSE_PURGE_LENGTH         50  // (mm) Length to extrude after loading.
+                                                  //   Set to 0 for manual extrusion.
+                                                  //   Filament can be extruded repeatedly from the Filament Change menu
+                                                  //   until extrusion is consistent, and to purge old filament.
+
+                                                  // Filament Unload does a Retract, Delay, and Purge first:
+  #define FILAMENT_UNLOAD_RETRACT_LENGTH      13  // (mm) Unload initial retract length.
+  #define FILAMENT_UNLOAD_DELAY             5000  // (ms) Delay for the filament to cool after retract.
+  #define FILAMENT_UNLOAD_PURGE_LENGTH         8  // (mm) An unretract is done, then this length is purged.
+
+  #define PAUSE_PARK_NOZZLE_TIMEOUT           45  // (seconds) Time limit before the nozzle is turned off for safety.
+  #define FILAMENT_CHANGE_ALERT_BEEPS         10  // Number of alert beeps to play when a response is needed.
+  #define PAUSE_PARK_NO_STEPPER_TIMEOUT           // Enable for XYZ steppers to stay powered on during filament change.
+
+  //#define PARK_HEAD_ON_PAUSE                    // Park the nozzle during pause and filament change.
+  //#define HOME_BEFORE_FILAMENT_CHANGE           // Ensure homing has been completed prior to parking for filament change
+
+  //#define FILAMENT_LOAD_UNLOAD_GCODES           // Add M701/M702 Load/Unload G-codes, plus Load/Unload in the LCD Prepare menu.
+  //#define FILAMENT_UNLOAD_ALL_EXTRUDERS         // Allow M702 to unload all extruders above a minimum target temp (as set by M302)
 #endif
 
 // @section tmc

Marlin/src/feature/pause.cpp

  *
  * Returns 'true' if load was completed, 'false' for abort
  */
-bool load_filament(const float &load_length/*=0*/, const float &purge_length/*=0*/, const int8_t max_beep_count/*=0*/,
+bool load_filament(const float &slow_load_length/*=0*/, const float &fast_load_length/*=0*/, const float &purge_length/*=0*/, const int8_t max_beep_count/*=0*/,
                    const bool show_lcd/*=false*/, const bool pause_for_user/*=false*/,
                    const AdvancedPauseMode mode/*=ADVANCED_PAUSE_MODE_PAUSE_PRINT*/
 ) {
       lcd_advanced_pause_show_message(ADVANCED_PAUSE_MESSAGE_LOAD, mode);
   #endif
 
-  // Load filament
-  if (load_length) do_pause_e_move(load_length, FILAMENT_CHANGE_LOAD_FEEDRATE);
+  // Slow Load filament
+  if (slow_load_length) do_pause_e_move(slow_load_length, FILAMENT_CHANGE_SLOW_LOAD_FEEDRATE);
+
+  // Fast Load Filament
+  if (fast_load_length) {
+    #if FILAMENT_CHANGE_FAST_LOAD_ACCEL > 0
+      const float saved_acceleration = planner.retract_acceleration;
+      planner.retract_acceleration = FILAMENT_CHANGE_FAST_LOAD_ACCEL;
+    #endif
+
+    do_pause_e_move(fast_load_length, FILAMENT_CHANGE_FAST_LOAD_FEEDRATE);
+
+    #if FILAMENT_CHANGE_FAST_LOAD_ACCEL > 0
+      planner.retract_acceleration = saved_acceleration;
+    #endif
+  }
 
   #if ENABLED(ADVANCED_PAUSE_CONTINUOUS_PURGE)
 
 
     wait_for_user = true;
     for (float purge_count = purge_length; purge_count > 0 && wait_for_user; --purge_count)
-      do_pause_e_move(1, ADVANCED_PAUSE_EXTRUDE_FEEDRATE);
+      do_pause_e_move(1, ADVANCED_PAUSE_PURGE_FEEDRATE);
     wait_for_user = false;
 
   #else
         #endif
 
         // Extrude filament to get into hotend
-        do_pause_e_move(purge_length, ADVANCED_PAUSE_EXTRUDE_FEEDRATE);
+        do_pause_e_move(purge_length, ADVANCED_PAUSE_PURGE_FEEDRATE);
       }
 
       // Show "Purge More" / "Resume" menu and wait for reply
       #endif
     );
 
-  #endif      
+  #endif
 
   return true;
 }
   do_pause_e_move(FILAMENT_UNLOAD_RETRACT_LENGTH + FILAMENT_UNLOAD_PURGE_LENGTH, planner.max_feedrate_mm_s[E_AXIS]);
 
   // Unload filament
+  #if FILAMENT_CHANGE_UNLOAD_ACCEL > 0
+    const float saved_acceleration = planner.retract_acceleration;
+    planner.retract_acceleration = FILAMENT_CHANGE_UNLOAD_ACCEL;
+  #endif
+
   do_pause_e_move(unload_length, FILAMENT_CHANGE_UNLOAD_FEEDRATE);
 
+  #if FILAMENT_CHANGE_FAST_LOAD_ACCEL > 0
+    planner.retract_acceleration = saved_acceleration;
+  #endif
+
   // Disable extruders steppers for manual filament changing (only on boards that have separate ENABLE_PINS)
   #if E0_ENABLE_PIN != X_ENABLE_PIN && E1_ENABLE_PIN != Y_ENABLE_PIN
     disable_e_stepper(active_extruder);
  * - Send host action for resume, if configured
  * - Resume the current SD print job, if any
  */
-void resume_print(const float &load_length/*=0*/, const float &purge_length/*=ADVANCED_PAUSE_EXTRUDE_LENGTH*/, const int8_t max_beep_count/*=0*/) {
+void resume_print(const float &slow_load_length/*=0*/, const float &fast_load_length/*=0*/, const float &purge_length/*=ADVANCED_PAUSE_PURGE_LENGTH*/, const int8_t max_beep_count/*=0*/) {
   if (!did_pause_print) return;
 
   // Re-enable the heaters if they timed out
 
   if (nozzle_timed_out || thermalManager.hotEnoughToExtrude(active_extruder)) {
     // Load the new filament
-    load_filament(load_length, purge_length, max_beep_count, true, nozzle_timed_out);
+    load_filament(slow_load_length, fast_load_length, purge_length, max_beep_count, true, nozzle_timed_out);
   }
 
   #if ENABLED(ULTIPANEL)
     if (fwretract.retracted[active_extruder])
       do_pause_e_move(-fwretract.retract_length, fwretract.retract_feedrate_mm_s);
   #endif
+
   // If resume_position is negative
   if (resume_position[E_AXIS] < 0) do_pause_e_move(resume_position[E_AXIS], PAUSE_PARK_RETRACT_FEEDRATE);
 
 
   // Now all extrusion positions are resumed and ready to be confirmed
   // Set extruder to saved position
-  planner.set_e_position_mm(destination[E_AXIS] = current_position[E_AXIS] = resume_position[E_AXIS]);
+  planner.set_e_position_mm((destination[E_AXIS] = current_position[E_AXIS] = resume_position[E_AXIS]));
 
   #if ENABLED(FILAMENT_RUNOUT_SENSOR)
     runout.reset();

Marlin/src/feature/pause.h

 
 void wait_for_filament_reload(const int8_t max_beep_count=0);
 
-void resume_print(const float &load_length=0, const float &extrude_length=ADVANCED_PAUSE_EXTRUDE_LENGTH, const int8_t max_beep_count=0);
+void resume_print(const float &slow_load_length=0, const float &fast_load_length=0, const float &extrude_length=ADVANCED_PAUSE_PURGE_LENGTH, const int8_t max_beep_count=0);
 
-bool load_filament(const float &load_length=0, const float &extrude_length=0, const int8_t max_beep_count=0, const bool show_lcd=false,
+bool load_filament(const float &slow_load_length=0, const float &fast_load_length=0, const float &extrude_length=0, const int8_t max_beep_count=0, const bool show_lcd=false,
                           const bool pause_for_user=false, const AdvancedPauseMode mode=ADVANCED_PAUSE_MODE_PAUSE_PRINT);
 
 bool unload_filament(const float &unload_length, const bool show_lcd=false, const AdvancedPauseMode mode=ADVANCED_PAUSE_MODE_PAUSE_PRINT);

Marlin/src/gcode/feature/pause/M600.cpp

     #endif
   );
 
+  // Lift Z axis
+  if (parser.seenval('Z')) park_point.z = parser.linearval('Z');
+
   // Move XY axes to filament change position or given position
   if (parser.seenval('X')) park_point.x = parser.linearval('X');
   if (parser.seenval('Y')) park_point.y = parser.linearval('Y');
 
-  // Lift Z axis
-  if (parser.seenval('Z')) park_point.z = parser.linearval('Z');
-
   #if HOTENDS > 1 && DISABLED(DUAL_X_CARRIAGE) && DISABLED(DELTA)
     park_point.x += (active_extruder ? hotend_offset[X_AXIS][active_extruder] : 0);
     park_point.y += (active_extruder ? hotend_offset[Y_AXIS][active_extruder] : 0);
   const float unload_length = -FABS(parser.seen('U') ? parser.value_axis_units(E_AXIS)
                                                      : filament_change_unload_length[active_extruder]);
 
-  // Load filament
-  const float load_length = FABS(parser.seen('L') ? parser.value_axis_units(E_AXIS)
-                                                  : filament_change_load_length[active_extruder]);
+  // Slow load filament
+  constexpr float slow_load_length = FILAMENT_CHANGE_SLOW_LOAD_LENGTH;
+
+  // Fast load filament
+  const float fast_load_length = FABS(parser.seen('L') ? parser.value_axis_units(E_AXIS)
+                                                       : filament_change_load_length[active_extruder]);
 
   const int beep_count = parser.intval('B',
     #ifdef FILAMENT_CHANGE_ALERT_BEEPS
 
   if (pause_print(retract, park_point, unload_length, true)) {
     wait_for_filament_reload(beep_count);
-    resume_print(load_length, ADVANCED_PAUSE_EXTRUDE_LENGTH, beep_count);
+    resume_print(slow_load_length, fast_load_length, ADVANCED_PAUSE_PURGE_LENGTH, beep_count);
   }
 
   #if EXTRUDERS > 1

Marlin/src/gcode/feature/pause/M701_M702.cpp

   // Z axis lift
   if (parser.seenval('Z')) park_point.z = parser.linearval('Z');
 
-  // Load filament
-  const float load_length = FABS(parser.seen('L') ? parser.value_axis_units(E_AXIS) :
-                                                    filament_change_load_length[target_extruder]);
-
   // Show initial "wait for load" message
   #if ENABLED(ULTIPANEL)
     lcd_advanced_pause_show_message(ADVANCED_PAUSE_MESSAGE_LOAD, ADVANCED_PAUSE_MODE_LOAD_FILAMENT, target_extruder);
   if (park_point.z > 0)
     do_blocking_move_to_z(min(current_position[Z_AXIS] + park_point.z, Z_MAX_POS), NOZZLE_PARK_Z_FEEDRATE);
 
-  load_filament(load_length, ADVANCED_PAUSE_EXTRUDE_LENGTH, FILAMENT_CHANGE_ALERT_BEEPS, true,
-                thermalManager.wait_for_heating(target_extruder), ADVANCED_PAUSE_MODE_LOAD_FILAMENT);
+  // Load filament
+  constexpr float slow_load_length = FILAMENT_CHANGE_SLOW_LOAD_LENGTH;
+  const float fast_load_length = FABS(parser.seen('L') ? parser.value_axis_units(E_AXIS)
+                                                       : filament_change_load_length[active_extruder]);
+  load_filament(slow_load_length, fast_load_length, ADVANCED_PAUSE_PURGE_LENGTH, FILAMENT_CHANGE_ALERT_BEEPS,
+                true, thermalManager.wait_for_heating(target_extruder), ADVANCED_PAUSE_MODE_LOAD_FILAMENT);
 
   // Restore Z axis
   if (park_point.z > 0)

Marlin/src/inc/Conditionals_post.h

 #define QUIET_PROBING (HAS_BED_PROBE && (ENABLED(PROBING_HEATERS_OFF) || ENABLED(PROBING_FANS_OFF) || DELAY_BEFORE_PROBING > 0))
 #define HEATER_IDLE_HANDLER (ENABLED(ADVANCED_PAUSE_FEATURE) || ENABLED(PROBING_HEATERS_OFF))
 
+#if ENABLED(ADVANCED_PAUSE_FEATURE) && !defined(FILAMENT_CHANGE_SLOW_LOAD_LENGTH)
+  #define FILAMENT_CHANGE_SLOW_LOAD_LENGTH 0
+#endif
+
 /**
  * Only constrain Z on DELTA / SCARA machines
  */

Marlin/src/inc/SanityCheck.h

   #error "FILAMENT_CHANGE_RETRACT_LENGTH is now PAUSE_PARK_RETRACT_LENGTH. Please update your configuration."
 #elif defined(FILAMENT_CHANGE_EXTRUDE_FEEDRATE)
   #error "FILAMENT_CHANGE_EXTRUDE_FEEDRATE is now ADVANCED_PAUSE_EXTRUDE_FEEDRATE. Please update your configuration."
+#elif defined(ADVANCED_PAUSE_EXTRUDE_FEEDRATE)
+  #error "ADVANCED_PAUSE_EXTRUDE_FEEDRATE is now ADVANCED_PAUSE_PURGE_FEEDRATE. Please update your configuration."
 #elif defined(FILAMENT_CHANGE_EXTRUDE_LENGTH)
-  #error "FILAMENT_CHANGE_EXTRUDE_LENGTH is now ADVANCED_PAUSE_EXTRUDE_LENGTH. Please update your configuration."
+  #error "FILAMENT_CHANGE_EXTRUDE_LENGTH is now ADVANCED_PAUSE_PURGE_LENGTH. Please update your configuration."
+#elif defined(ADVANCED_PAUSE_EXTRUDE_LENGTH)
+  #error "ADVANCED_PAUSE_EXTRUDE_LENGTH is now ADVANCED_PAUSE_PURGE_LENGTH. Please update your configuration."
 #elif defined(FILAMENT_CHANGE_NOZZLE_TIMEOUT)
   #error "FILAMENT_CHANGE_NOZZLE_TIMEOUT is now PAUSE_PARK_NOZZLE_TIMEOUT. Please update your configuration."
 #elif defined(FILAMENT_CHANGE_NUMBER_OF_ALERT_BEEPS)
   #error "[AXIS]_IS_TMC is now [AXIS]_IS_TMC26X. Please update your Configuration_adv.h."
 #elif defined(AUTOMATIC_CURRENT_CONTROL)
   #error "AUTOMATIC_CURRENT_CONTROL is now MONITOR_DRIVER_STATUS. Please update your configuration."
+#elif defined(FILAMENT_CHANGE_LOAD_LENGTH)
+  #error "FILAMENT_CHANGE_LOAD_LENGTH is now FILAMENT_CHANGE_FAST_LOAD_LENGTH. Please update your configuration."
 #endif
 
 /**
     #error "ADVANCED_PAUSE_FEATURE requires NOZZLE_PARK_FEATURE."
   #elif ENABLED(PREVENT_LENGTHY_EXTRUDE) && FILAMENT_CHANGE_UNLOAD_LENGTH > EXTRUDE_MAXLENGTH
     #error "FILAMENT_CHANGE_UNLOAD_LENGTH must be less than or equal to EXTRUDE_MAXLENGTH."
-  #elif ENABLED(PREVENT_LENGTHY_EXTRUDE) && FILAMENT_CHANGE_LOAD_LENGTH > EXTRUDE_MAXLENGTH
-    #error "FILAMENT_CHANGE_LOAD_LENGTH must be less than or equal to EXTRUDE_MAXLENGTH."
+  #elif ENABLED(PREVENT_LENGTHY_EXTRUDE) && FILAMENT_CHANGE_SLOW_LOAD_LENGTH > EXTRUDE_MAXLENGTH
+    #error "FILAMENT_CHANGE_SLOW_LOAD_LENGTH must be less than or equal to EXTRUDE_MAXLENGTH."
+  #elif ENABLED(PREVENT_LENGTHY_EXTRUDE) && FILAMENT_CHANGE_FAST_LOAD_LENGTH > EXTRUDE_MAXLENGTH
+    #error "FILAMENT_CHANGE_FAST_LOAD_LENGTH must be less than or equal to EXTRUDE_MAXLENGTH."
   #endif
 #endif
 

Marlin/src/module/configuration_store.cpp

   #if ENABLED(ADVANCED_PAUSE_FEATURE)
     for (uint8_t e = 0; e < E_STEPPERS; e++) {
       filament_change_unload_length[e] = FILAMENT_CHANGE_UNLOAD_LENGTH;
-      filament_change_load_length[e] = FILAMENT_CHANGE_LOAD_LENGTH;
+      filament_change_load_length[e] = FILAMENT_CHANGE_FAST_LOAD_LENGTH;
     }
   #endif