Nema 17 Cycloidal Gear box prototype

https://youtu.be/UkCXxV2Ygx0

This is a prototype for a nema 17 size cycloid gearbox with a reduction 1/28
you need
2 ball bearings 608
4 M3x35
4 M3 nut
1 M3x12
1 M8x ... Output shaft
a nema 17 stepper motor with 5mm axle
and some washer

things to do :

calculate the teeth ...in the moment they are constructed
calculate for different gear ratios
test the speed at which it is useful with only one runner
construct it for counterweight runners for faster speed
test the weight it can handle without breaking
multiple output shaft options
cleanup openscad files for publishing

as i have no time at the moment i post the messy openscad files