> - Constructive solid geometry. Create a cylinder. Create a thread form. Extrude the thread form along a spiral. Subtract that from the cylinder to get a screw

> - Constructive solid geometry. Create a cylinder. Create a thread form. Extrude the thread form along a spiral. Subtract that from the cylinder to get a screw. Chamfer the end. Autodesk Inventor has been able to do that since about 2014, which is what you get for the big bucks. There's some open source code, but historically it hasn't handled the hard cases well. This matters when the next step is cutting the part out of metal. In freecad I didn't encounter any issue doing just that. Of course we are 10y later, so maybe things have improved. I made quite elaborate custom threads for 3D printing this way.