A generic knob I designed to fix a floor fan for a friend. His was missing the knob and he was using pliers to adjust the speeds so I designed and printed this.

One knob has two flats in the mounting hole for the particular use I needed.

There is a second knob with a D-shaped hole for a corresponding shaft.

It has a hollow in the back to clear the mounting screws of the actual switch so supports are recommended.

2024-3-24 Added photo of printed knob.
2024-3-25 Added knob with D shaped hole.

Bambu Lab

A1

Doesn't Matter

Yes