I printed timing gears for
eq3 mount (post #32) it is sufficiently accurate even for tracking of 200mm lens.
There are number of parametric design available on Thingiverse, I used (for ALTAZ encoder) and commented this one, there was an issue with code, read the comments and correct the code accordingly:
https://www.thingiverse.com/thing:36568/comments
It is definitely worth a try to print the pulleys and gears.. any inaccuracies will be sorted out with guiding anyway.
Perhaps you should consider friction transmission, like
this one (inspired and driven by
Mel Bartels' software) or similar
Bigger wheels can be made from plywood, without access to "real" lathe, with relatively simple jig (using router).
See here:
https://www.bbastrodesigns.com/mechanic.html
and here:
https://www.instructables.com/id/Con...arium-Arduino/
For electronics, I highly recommend OnStep (
https://onstep.groups.io/g/main/topics)