Next up: I wrote a #FreeCAD macro for rib thread forming, rule R5.4 from my Design for 3D-Printing guide.
https://github.com/rahix/FreeCAD-Macros/tree/main/RibThreads
I didn't even have time to verify all the thread sizes yet (because I'm not home and no mobile 3D-printer yet), so if someone wants to help out here, please do :)