Apollo SL15M Com Selector Knob

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My used SL15M arrived without a plastic knob for the com selector, and no one was willing to sell a 15 cent knob for its own $1000 audio panel. I adapted by using the volume knob as a reference point to maintain consistency in the design. This part needs to be printed with transparent materials or multi-material processing to preserve the light channel for nighttime illumination. For simplicity, I opted to print it out of black PLA.