These are add-on knobs for P3386 potentiometers. They press-fit into the existing screwdriver slot.

I designed these because while you can buy them with knobs from the factory, they're harder to get and cost two or three times as much as the plain screwdriver-slot ones, which aren't cheap to start with.

There are tall and short versions of several styles. I prefer the short versions.

I hope these are useful to other electronics hobbyists.

FLsun QQ-S Pro

No

No

0.2mm

10%

These are a perfect friction fit for me; if they're too tight or too loose when you print them, scale the model in your slicer up or down a tiny amount.