2-ring 6mm Potentiometer Knob - Star Hole
thingiverse
The original worked great for spline-shaft potentiometers with a bit of scaling (95% worked for me for Alpha brand pots). However, due to some supply issues I had to use smooth-shaft knobs for some of my pots. 100% was too small, 101% was pretty snug but slipped on the smooth pot. So I put the original in TinkerCad and added a star-shaped tapered interior hole. This gives relief for the plastic to deform and concentrates the friction into 16 contact points.
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