Here's the story behind this Thing: My buddy's 1971 Gibson SG got smashed, knocking off a chunk comprising most of the electronics and control knobs. So, I 3D printed a repair patch using SainSmart wood filament. The repaired guitar can be seen in the photos above. However, one control knob was lost in the catastrophe, so I decided the 3D print a replacement. Note that the STL file provided differs from the real knob in that it does not have the numbers around the rim.
You can see the 3D printed patched Gibson SG played live in a video here:
To see the bands performance skip to minute 49 of the video.
Other guitar knobs I've designed:
Added some aluminum tape in the raised center section to mimic the real deal knob.
Also, you may have to drill out the center hole if its too tight for your potentiometers.