A user reached out to me since their Epiphone Les Paul Ultra II was missing both the audio jack plate as well as a knob for the NanoMag preamp, asking if I had a model of this part, too.
I didn't…. So I made one.
This is a beautiful friction fit that is entirely feasible with an FDM printer (0.4mm nozzle, 0.15mm layer height, for me)
It rotates without dragging anywhere and can be removed without much hassle.
Be sure to unscrew the backplate so you can brace the PCB from behind when pressing in this replacement knob. It doesn't require much force, but the PCB will bend out of the way if you don't, as the fit is marginally tighter than with the original knobs.
The author marked this model as their own original creation.