I find the factory dial knob on the Original Prusa i3 MK3 printer a bit tiny and awkward to fiddle around with. So I set out to design a "better" and more ergonomic one. I was inspired by the serrated dial knobs often found on vintage electronic appliances.
This knob not only has serrations which make it easier to grab and turn, but also has a chamfered edge to make it more comfortable to touch. It has a depression on top like the original so that it's easy to push down.
While the knob was designed for the Prusa printer, it can be used as a generic dial for any potentiometer with a 6mm diameter shaft.
If you find this part useful, please consider a Designer Tip – this helps me to keep the filament flowing :)
Despite having the hole for the shaft on the bottom side of the print, I was able to print the model just fine without the need for any support for bridging the 6mm hole.
Remove the original dial by carefully using a plastic ruler or similar tool as a lever.
Then push the new knob firmly onto the shaft of the potentiometer.
The knob (specfically, the depression) might benefit from some sanding and a subsequent coat of paint.
My Prusa MK3 came in black, and I think that a knob in silver actually suits it quite well :)