I made this to put a set screw based pot knob on my F75 keyboard. The standard vertical groove style pot shaft is too short for the set screws to engage. This engages nicely with the pot, glue optional, and provides a triangular shape for the three set screws on the knob to engage with.

100% infill. No supports, hole facing print bed.

This model is parametric. Just open up the openscad file and adjust to set how far the knob should go in, and how far the triangular part should protrude. Be sure that Pot1.stl is in the same folder as scad script.