Snappy V2.0: Land of confusion.

[MisterAcoustic]

I read a little more closely about the nutsnbolts library, and apparently it does not produce proper threads (non-manifold).

There is another library that claims to do manifold threads. The license says that commercial use is NOT allowed:
https://www.thingiverse.com/thing:1659079

Seems like you could use nutsnbolts to block everything out, and place threads where needed using the other one.