Apollo SL15M Com Selector Knob

My used SL15M came without the plastic knob for the com selector, and no one wanted to sell a 15 cent knob for a $1000 audio panel on its own. I used the volume knob as reference to keep the design as consistent as possible.

This part needs to be printed with transparent materials or multi-material process in order to keep the light channel intact for night time illumination. I just printed it out of black PLA for simplicity sake.