Merge pull request #6021 from Bob-the-Kuhn/BUG-FIX--Switching-extruder-tool-change-Z-height

Bug Fix: Switching extruder tool change leaves Z in wrong position

Marlin/Marlin_main.cpp

@@ -8033,6 +8033,7 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
                   z_raise = 0.3 + (z_diff > 0.0 ? z_diff : 0.0);
 
             // Always raise by some amount (destination copied from current_position earlier)
+            float save_Z = destination[Z_AXIS];  // save Z for later on
             destination[Z_AXIS] += z_raise;
             planner.buffer_line_kinematic(destination, planner.max_feedrate_mm_s[Z_AXIS], active_extruder);
             stepper.synchronize();
@@ -8046,6 +8047,7 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
               planner.buffer_line_kinematic(destination, planner.max_feedrate_mm_s[Z_AXIS], active_extruder);
               stepper.synchronize();
             }
+            destination[Z_AXIS] = save_Z;  // restore original Z position so the 'Move to the "old position"' is correct
           #endif
 
           /**