This is a simple extruder I made for 1.75mm filament. The only things you need to complete is an insert for motor shaft and a 8 x 11 x 7mm Bearing and some 3mm screws. It will fit a Nema 17 Stepper Motor and the famous chineese extruder. (the black one that you easily find on eBay) Enjoy ! http://www.youtube.com/watch?v=sRRu5mCk6TQ&feature=youtu.be http://www.youtube.com/watch?v=5AlZcp0Gpig 3D Print the two portions and squeeze the Extruder and the Bearing between. Screw it to the Stepper Motor and add 2 screws each sides of the extruder. Add one screw to the center of the bearing. (5) screws total.