A very prototype repurpose/recycle old Nema17 motors with press fit pulleys on them. This will add some length on the motor body; but the carrier is designed to allow a custom 20T pulley to be added at a desired length, or you can manually drill or CAD cut a 8MM hole to secure a screw. The shaft is 12mm thick so no problems on durability for most materials. Once I get done testing Ill upload more instructions and whatnot.

Assembly: Still getting the flaws out to make this as easy as possible. So after tweaking, start at the motor and install each part moving upwards.1) Shim if needed2) Gearbox housing lower3) Fit gears(use medium to heavy weight grease or lube)4) Lower/fit gearbox housing top5) Fit Carrier6) Screw in carrier retainer and whole assembly with M3 screws.

E-steps you need to multiply your current steps by 4. Turn down acceleration to NO MORE than 17% of what it was. This applies to standard Nema17 motors and a 8-bit controller. If you have better hardware, then you can experiment further. You have been warned. Currently mostly tuned in except for compensating for resonance frequencies are:[Ender 3 Pro]400 Axis steps per mm3000-3400 Max Feedrate mm/min(If you havent changed much in Marlin and have a stock board)100 mm per second Max Acceleration0.4 mm per second Jerk