Parametric knob for keyed stems (fans, crock pots, etc.)

Parametric knob that can be used to fit onto a keyed stem (cylinder with a chopped off edge). Our crock pot had a missing knob, so I created this to replace the missing knob. It works great!

A small depressed indicator circle marks where the indicator is pointing and the circle can have a small dab of paint added to help with clarity.