Make screws with a thread

How do I make a screw an a screw hole for 3d print. and

Do you need real screw threads? Do you need them to match some standard screw thread?

It is possible to create useful screw threads. I would suggest modeling as if millimeters are meters so you can use higher numbers of sides for circles, arcs, and other curves. These were modeled that way.
Machinist Jack

U-Joint 3D Printed

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