Hi kb, also some other resources:

Using a thread cutter you can probably get a lot higher precision:
https://www.youtube.com/watch?v=vb6mAQ-s73A

There are also some video tutorials for Rhino. I have not gone through them all but it is likely that the same techniques can be used in MoI:
https://www.youtube.com/watch?v=zXqAgIbBmPo
https://www.youtube.com/watch?v=aGAeT-pJD-w
https://www.youtube.com/watch?v=3UYFT717duY
https://www.youtube.com/watch?v=5OZB0LLgRHU

There will probably be a lot of variation in what will work good depending on the resolution of your printer.

- Michael