Bugfix: double wipe was not prevented, causing potential collision between objects in sequential printing. #2691

lib/Slic3r/GCode.pm

@@ -589,6 +589,9 @@ sub wipe {
             $retracted += $dE;
         }
         $gcodegen->writer->extruder->set_retracted($gcodegen->writer->extruder->retracted + $retracted);
+        
+        # prevent wiping again on same path
+        $self->path(undef);
     }
     
     return $gcode;