The file 'Ender 3 Extruder Knob 3D Printer Model' is (stl) file type, size is 179.0KB.
Ender 3 extruder knob. Probably could work for all extruders. Put this o the cold end extruder on top of the gear that pushed the filament and twist when you want to push or pull filament in to or out of your hot end.
Extruder_Knob.stl | 688.6KB |