This is a thumb rest designed to fit on a Fender/Squier Jazz Bass or similar. It won't fit on a Precision due to the hole spacing being different.
Since it uses the already existing pickguard screw holes no drilling is required. The mounting holes are 58 mm apart, it is a good idea to check if it will fit your bass before printing.
Designed in Autodesk Fusion 360 and printed on an Original Prusa MINI.
please ignore all the fingerprints : )
I printed mine at .10 so that I can't feel the layer lines on my thumb. It does take a while but it's definitely worth it.
The author hasn't provided the model origin yet.