M12 x 3 Thumbscrew - 12mm long

This is a part for a Sheffield marking gauge for clay (or woodworking). The original screw was some kind of resin plastic and the head snapped off. So we printed a new one!

Screw threads generated by: https://www.thingiverse.com/thing:2277141

The rest was modeled in tinkercad using basic cylinder and half-round shapes.

Not sure why the threads have little bits in the threads. Must have been a translation error between tinkercad and openscad. They file off pretty easily with a triangular