A fully functional, slim and stackable cycloidal drive designed by me (BLJ ENGINEERING, @protoboard)

Features

• Prints without support.
• Easy to assemble, just align the index marks as you go.

• Reduction ratio 15:1
• Can be hand-driven with the included input knob. TIP: Use the knob as an adapter to a standard 1/4in (6,35mm) hex bit.
• Stackable: A reduction ratio of 225:1 is achieved with two drives.
• Fits faceplate/ bolt holes on standard NEMA 23 motors.
• <1h print time in most cases.

Tested in PLA and ABS. Any config should work. Tolerances are somewhat loose. Matte filament: After the first few turns, just rinse the parts in water to flush out the dust, if any. A dab of Vaseline or coking oil works great.

Please use with caution around small kids - small parts!