Allow Z_SAFE_HOMING without a probe

Marlin/Conditionals_post.h

    * Bed Probe dependencies
    */
   #if HAS_BED_PROBE
-    #ifndef X_PROBE_OFFSET_FROM_EXTRUDER
-      #define X_PROBE_OFFSET_FROM_EXTRUDER 0
-    #endif
-    #ifndef Y_PROBE_OFFSET_FROM_EXTRUDER
-      #define Y_PROBE_OFFSET_FROM_EXTRUDER 0
-    #endif
-    #ifndef Z_PROBE_OFFSET_FROM_EXTRUDER
-      #define Z_PROBE_OFFSET_FROM_EXTRUDER 0
-    #endif
     #ifndef Z_PROBE_OFFSET_RANGE_MIN
       #define Z_PROBE_OFFSET_RANGE_MIN -20
     #endif
     #else
       #define _Z_RAISE_PROBE_DEPLOY_STOW Z_RAISE_PROBE_DEPLOY_STOW
     #endif
+  #else
+    #undef X_PROBE_OFFSET_FROM_EXTRUDER
+    #undef Y_PROBE_OFFSET_FROM_EXTRUDER
+    #undef Z_PROBE_OFFSET_FROM_EXTRUDER
+    #define X_PROBE_OFFSET_FROM_EXTRUDER 0
+    #define Y_PROBE_OFFSET_FROM_EXTRUDER 0
+    #define Z_PROBE_OFFSET_FROM_EXTRUDER 0
   #endif
 
   /**

Marlin/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/Marlin_main.cpp

             SYNC_PLAN_POSITION_KINEMATIC();
 
             /**
-             * Set the Z probe (or just the nozzle) destination to the safe
-             *  homing point
+             * Move the Z probe (or just the nozzle) to the safe homing point
              */
             destination[X_AXIS] = round(Z_SAFE_HOMING_X_POINT - (X_PROBE_OFFSET_FROM_EXTRUDER));
             destination[Y_AXIS] = round(Z_SAFE_HOMING_Y_POINT - (Y_PROBE_OFFSET_FROM_EXTRUDER));
-            destination[Z_AXIS] = current_position[Z_AXIS]; //z is already at the right height
+            destination[Z_AXIS] = current_position[Z_AXIS]; // Z is already at the right height
 
             #if ENABLED(DEBUG_LEVELING_FEATURE)
               if (DEBUGGING(LEVELING)) {

Marlin/SanityCheck.cpp

     #error "AUTO_BED_LEVELING_FEATURE requires a probe! Define a Z Servo, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or FIX_MOUNTED_PROBE."
   #elif ENABLED(Z_MIN_PROBE_REPEATABILITY_TEST)
     #error "Z_MIN_PROBE_REPEATABILITY_TEST requires a probe! Define a Z Servo, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or FIX_MOUNTED_PROBE."
-  #elif ENABLED(Z_SAFE_HOMING)
-    #error "Z_SAFE_HOMING currently requires a probe."
   #endif
 
 #endif
  */
 #if ENABLED(Z_SAFE_HOMING)
   #if Z_SAFE_HOMING_X_POINT < MIN_PROBE_X || Z_SAFE_HOMING_X_POINT > MAX_PROBE_X
-    #error "The given Z_SAFE_HOMING_X_POINT can't be reached by the Z probe."
+    #if HAS_BED_PROBE
+      #error "Z_SAFE_HOMING_X_POINT can't be reached by the Z probe."
+    #else
+      #error "Z_SAFE_HOMING_X_POINT can't be reached by the nozzle."
+    #endif
   #elif Z_SAFE_HOMING_Y_POINT < MIN_PROBE_Y || Z_SAFE_HOMING_Y_POINT > MAX_PROBE_Y
-    #error "The given Z_SAFE_HOMING_Y_POINT can't be reached by the Z probe."
+    #if HAS_BED_PROBE
+      #error "Z_SAFE_HOMING_Y_POINT can't be reached by the Z probe."
+    #else
+      #error "Z_SAFE_HOMING_Y_POINT can't be reached by the nozzle."
+    #endif
   #endif
 #endif // Z_SAFE_HOMING
 

Marlin/example_configurations/Cartesio/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/Felix/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/Felix/DUAL/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/Hephestos/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/Hephestos_2/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 #define Z_SAFE_HOMING
 

Marlin/example_configurations/K8200/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/K8400/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/K8400/Dual-head/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/RigidBot/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/SCARA/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/TAZ4/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/WITBOX/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/adafruit/ST7565/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/delta/biv2.5/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/delta/generic/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/delta/kossel_mini/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/delta/kossel_pro/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 #define Z_SAFE_HOMING
 

Marlin/example_configurations/delta/kossel_xl/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/makibox/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING
 

Marlin/example_configurations/tvrrug/Round2/Configuration.h

 //
 // - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
 // - If stepper drivers time out, it will need X and Y homing again before Z homing.
-// - Position the Z probe in a defined XY point before Z Homing when homing all axes (G28).
+// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
 // - Prevent Z homing when the Z probe is outside bed area.
 //#define Z_SAFE_HOMING