My secondhand Allen & Heath MixWizard was missing an EQ knob. I thought this would be a good opportunity to learn a little bit of TinkerCAD.

Printing:
I used PETG with an in-fill of 50%. Should be fine with other materials, too.

This is a single piece, but one of you clever cats out in the interwebs is probably smart enough to be able to design knob-top inserts that could be printed out in colors like the original knobs.

Creality

Ender 3

Doesn't Matter

Yes

200

50