Nema 17 Cycloidal Gearbox

This is a cycloidal gearbox for a standard Nema 17 stepper motor designed to be as efficient as possible while maintaining a compact size. The gearbox provides an 8:1 gear reduction. Most of the design is 3D printed, but it uses a number of easily sourced non-printed parts to improve reliability and durability.

This is a redesign of my earlier stacking planetary gearbox which only provided a 4:1 gear reduction. This design is about 20% taller but provides double the gear reduction.

Non-Printed Parts:

1. 2x M3x12mm screws (amazon*)

2. 2x M3 (6mm L x 5mm OD) threaded inserts (amazon*)

3. 2x 30x37x4mm ball bearings (amazon*)

4. 2x 10x15x4mm ball bearings (amazon*)

5. 17x 2x20mm dowel pins (amazon*)

* Affiliate links support my work by helping me earn a small commission at no cost to you.

Modding:

I support anyone who wants to modify this design and create their own remixes. To make things easier, I provide the onshape document.