Parametric Knob for Hex Bolts

A couple of different knobs, designed to fit standard 1/4", 3/8", and 1/2" bolts. The fit should be pretty snug just printing "as-is," but you might need to apply some heat or superglue if it's either too tight or too loose. ABS with 4 shells/30% fill is probably enough to withstand anything you can do by hand, even on a 1/2" bolt; adjust accordingly.

These are designed for SAE bolts, though the files themselves are spec'd in metric, so you won't need to scale them up before slicing/printing. To fit other bolts or adjust the fit, look to the script below.

This object was parametrically designed using Python, FreeCAD, and CadQuery, so the code and yet more documentation is available here:

https://github.com/swolebro/caddyshack