Hi Eric, I've used https://github.com/nophead/NopSCADlib/tree/master/utils  - thread scad . Works well. But for small sizes, I use small self tapping screws, or tap the holes. If you must use machine screws, but have no tap, then print the hole at such a size that you can use the screw to deform the plastic. For fine pitched threads, you will need to be very careful if using the fastener more than a few times. If it needs  frequent unscrewing then use  a brass insert. Best wishes, Ray On 16/02/2022 12:37, Eric Frank via Discuss wrote: > [OpenSCAD] making threaded holes with OpenScad?.eml > > Subject: > [OpenSCAD] making threaded holes with OpenScad? > From: > Eric Frank <efrank03@mac.com> > Date: > 16/02/2022, 12:37 > > To: > discuss@lists.openscad.org > > > Is it possible to make threaded holes with OpenScad? I am trying to make a 2 mm threaded hole, about 2.4 mm in diameter. Is there a command in OpenScad that makes threaded holes in plastic. > > Thanks, > Eric