[2.0.x] Add simultaneous retraction for mixing extruder (#11941)

Marlin/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/default/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/AlephObjects/TAZ4/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Anet/A2/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Anet/A2plus/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Anet/A6/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Anet/A8/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/BIBO/TouchX/cyclops/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/BIBO/TouchX/default/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/BQ/Hephestos/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/BQ/Hephestos_2/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/BQ/WITBOX/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Cartesio/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Creality/CR-10/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Creality/CR-10S/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Creality/CR-10mini/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Creality/CR-8/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Creality/Ender-2/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Creality/Ender-3/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Creality/Ender-4/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Einstart-S/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Felix/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/FolgerTech/i3-2020/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Formbot/Raptor/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Formbot/T_Rex_2+/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Formbot/T_Rex_3/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Geeetech/Prusa i3 Pro C/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Geeetech/Prusa i3 Pro W/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Infitary/i3-M508/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/JGAurora/A5/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/MakerParts/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Malyan/M150/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Malyan/M200/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Micromake/C1/enhanced/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Mks/Sbase/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/RigidBot/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/SCARA/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Sanguinololu/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/TheBorg/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/TinyBoy2/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Tronxy/X3A/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/UltiMachine/Archim2/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Velleman/K8200/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Velleman/K8400/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/Wanhao/Duplicator 6/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/delta/Anycubic/Kossel/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/delta/FLSUN/auto_calibrate/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/delta/FLSUN/kossel/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/delta/FLSUN/kossel_mini/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/delta/generic/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/delta/kossel_mini/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/delta/kossel_xl/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/gCreate/gMax1.5+/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/makibox/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/tvrrug/Round2/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/config/examples/wt150/Configuration_adv.h

   #define RETRACT_RECOVER_LENGTH_SWAP 0   // Default additional swap recover length (mm, added to retract length when recovering from extruder change)
   #define RETRACT_RECOVER_FEEDRATE 8      // Default feedrate for recovering from retraction (mm/s)
   #define RETRACT_RECOVER_FEEDRATE_SWAP 8 // Default feedrate for recovering from swap retraction (mm/s)
+  #if ENABLED(MIXING_EXTRUDER)
+    //#define RETRACT_SYNC_MIXING         // Retract and restore all mixing steppers simultaneously
+  #endif
 #endif
 
 /**

Marlin/src/feature/fwretract.cpp

 #include "../module/planner.h"
 #include "../module/stepper.h"
 
+#if ENABLED(RETRACT_SYNC_MIXING)
+  #include "../feature/mixing.h"
+#endif
+
 // private:
 
 #if EXTRUDERS > 1
   const float old_feedrate_mm_s = feedrate_mm_s,
               unscale_e = RECIPROCAL(planner.e_factor[active_extruder]),
               unscale_fr = 100.0 / feedrate_percentage, // Disable feedrate scaling for retract moves
-              base_retract = swapping ? swap_retract_length : retract_length;
+              base_retract = (
+                (swapping ? swap_retract_length : retract_length)
+                #if ENABLED(RETRACT_SYNC_MIXING)
+                  * (MIXING_STEPPERS)
+                #endif
+              );
 
   // The current position will be the destination for E and Z moves
   set_destination_from_current();
 
+  #if ENABLED(RETRACT_SYNC_MIXING)
+    float old_mixing_factor[MIXING_STEPPERS];
+    for (uint8_t i = 0; i < MIXING_STEPPERS; i++) {
+      old_mixing_factor[i] = mixing_factor[i];
+      mixing_factor[i] = RECIPROCAL(MIXING_STEPPERS);
+    }
+  #endif
+
   if (retracting) {
     // Retract by moving from a faux E position back to the current E position
-    feedrate_mm_s = retract_feedrate_mm_s * unscale_fr;
+    feedrate_mm_s = (
+      retract_feedrate_mm_s * unscale_fr
+      #if ENABLED(RETRACT_SYNC_MIXING)
+        * (MIXING_STEPPERS)
+      #endif
+    );
     current_retract[active_extruder] = base_retract * unscale_e;
     prepare_move_to_destination();                        // set_current_to_destination
     planner.synchronize();                                // Wait for move to complete
     }
 
     current_retract[active_extruder] = 0.0;
-    feedrate_mm_s = (swapping ? swap_retract_recover_feedrate_mm_s : retract_recover_feedrate_mm_s) * unscale_fr;
+    feedrate_mm_s = (
+      (swapping ? swap_retract_recover_feedrate_mm_s : retract_recover_feedrate_mm_s) * unscale_fr
+      #if ENABLED(RETRACT_SYNC_MIXING)
+        * (MIXING_STEPPERS)
+      #endif
+    );
     prepare_move_to_destination();                        // Recover E, set_current_to_destination
     planner.synchronize();                                // Wait for move to complete
   }
 
+  #if ENABLED(RETRACT_SYNC_MIXING)
+    COPY(mixing_factor, old_mixing_factor);               // Restore original mixing factor
+  #endif
+
   feedrate_mm_s = old_feedrate_mm_s;                      // Restore original feedrate
   retracted[active_extruder] = retracting;                // Active extruder now retracted / recovered
 

Marlin/src/module/planner.cpp

   // Calculate and limit speed in mm/sec for each axis
   float current_speed[NUM_AXIS], speed_factor = 1.0f; // factor <1 decreases speed
   LOOP_XYZE(i) {
-    const float cs = ABS((current_speed[i] = delta_mm[i] * inverse_secs));
+    #if ENABLED(MIXING_EXTRUDER)
+      float delta_mm_i = 0;
+      if (i == E_AXIS) {
+        for (uint8_t s = 0; s < MIXING_STEPPERS; s++)
+          delta_mm_i = MAX(mixing_factor[s] * ABS(delta_mm[i]), delta_mm_i);
+      }
+      else delta_mm_i = ABS(delta_mm[i]);
+    #else
+      const float delta_mm_i = ABS(delta_mm[i]);
+    #endif
+    const float cs = current_speed[i] = delta_mm_i * inverse_secs;
     #if ENABLED(DISTINCT_E_FACTORS)
       if (i == E_AXIS) i += extruder;
     #endif