Nema 11 Planetary Gear Box, parametric, stackable

a planetary gearbox for Nema 11 stepper.
you can mount at the front or back side.
I will use it for a cnc tailstock on my Unimat SL lathe :-)
createt with OpenScad, you can change everything.
Have fun!
ratio
1 stack 1:3.75
2 stack 1:14.0625 and so on
(sorry for my bad english)
It's working :-) [Video](https://www.youtube.com/watch?v=RDBnqWvG0do)
* on right side front mount with one stack
* on left side back mount with two stack