SP 404 MKII Knurled Knob / Potentiometer Cap

I made this for the SP 404 MKii (and that's the only device I tested this with) but I think it should fit most pots.

Instructions

This model is composed of two parts, “knob” and “indicator” (red and white respectively in the picture above).

You can print only the “knob” part, which will leave a recessed area.

You can print the “indicator” part in another color and then simply slide it in the “knob” part, it does require some force as it's not meant to be removed.

I have printed this in Lipstick Red ASA Prusament and have fine tuned the dimensions to this filament (ASA is known to shrink). Your mileage may vary depending on your printer's quality and calibration and the filament type you use.
You can tweak the dimensions in the OnShape file, or simply by adjusting the scale of the model in your slicer; a few percents up or down should suffice.

I printed this with a 0.25 nozzle.

Source model file

The design file is publicly available on OnShape at this link.

I've also included the STEP files if you want to import the model in your favorite CAD software.