Gracy, I read your reply no less than 10 times trying to understand how you can use M600 gcode with Ender 6 but I still cannot figure out how to do that at the Start and End Codes. I own an Ender 6 and am trying to change the filament at a specific layer with M600. I am really getting to the point to realize that is undoable with Ender 6 unless Creality update the firmware. Please advise.