Many RepRap controller firmwares support Firmware Retraction via G10/G11. (See http://reprap.org/wiki/G-code#G10:_Retract and http://reprap.org/wiki/G-code#G11:_Unretract) I know this has been asked for in the past so I was hoping to see this added to version 4 but it looks like I'll have to continu...