This is a quick change direct drive bowden extruder I designed for 1.75mm filament. This will allow you to quick change out your filament.The cam.stl will need to be printed with support. Also included an extruder body with built in support.I am using a 71oz/in nema 17 stepper with no issues.You can find the latest and greatest on my github also https://github.com/gennro/3dprinter