Summary

This is no longer the latest version! V2 can be found here: https://www.thingiverse.com/thing:6676361

A 56/1 cycloidal reduction for NEMA17, but the design can easily be modified in Onshape to meet your needs.

Reduction specs:

56/1 reduction.
NEMA 17 mounting.

BOM:

4x M3x25 cap head bolts
2x 10x15x4 bearings
1x 25x37x7 bearing
1x NEMA17 size motor

optional (for mounting to the actuator)
6x M3 locknuts
6x M3xX bolts

Tips for reducing backlash:

I have uploaded different versions of the cycloidal reducer with differing tolerances.

For more information regarding the parametric version, see the GitHub repository [https://github.com/OrnithopterX/Parametric-compound-cycloid-reducer]