fixed #6755

src/libslic3r/GCode.cpp

@@ -743,7 +743,7 @@ static std::vector<Vec2d> get_path_of_change_filament(const Print& print)
  || !needs_toolchange // this is just finishing the tower with no toolchange
  || is_ramming);
 
- if (should_travel_to_tower) {
+ if (should_travel_to_tower || gcodegen.m_need_change_layer_lift_z) {
  // FIXME: It would be better if the wipe tower set the force_travel flag for all toolchanges,
  // then we could simplify the condition and make it more readable.
  gcode += gcodegen.retract();