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BOSL2
The Belfry OpenScad Library, v2.0. An OpenSCAD library of shapes, masks, and manipulators to make working with OpenSCAD easier. BETA
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BOSL
The Belfry OpenScad Library - A library of tools, shapes, and helpers to make OpenScad easier to use.
If you really want to print threads, the BOSL2 library is very capable. I think it’s he most capable OpenSCAD library out there, and does a lot besides threading. Good luck!
Check out this module https://github.com/mechadense/scad-lib-FDMscrews
I use https://github.com/rcolyer/threads-scad and have had great results down to about an M6 screw size and haven't tried any smaller than that