Compact Extruder for 3mm filament

Just print the parts. Use 2pcs M3x10 screws to attach to the motor (left side). Use M3x16 screw for the idler-to-extruder body. The bearing is standard 608 skate bearing. Attach it with M4x10 (Notice that it's M4, not as the original M5!). If you have M4x12 which is more common in my case - use the spacer. For the Idler tension - you can use a M3 screw bigger than 12mm in length! It's a good idea to put a spring there as you have a notch with which you'll be able to change the filament easily!