Polivoks-style knobs for Eurorack synthesizer modules

Two different sizes of potentiometer knob for a synthesizer module, based on the design of the original Polivoks knobs but reduced in size to be suitable for a Eurorack panel.

These knobs are designed to fit spline shaft potentiometers. These come in two different forms, with either a ridge or a valley of the spline in line with the centre axis of the shaft. I've therefore included two versions of each knob with the splines rotated by 10° to allow for both possibilities. The tolerances are adjusted so that prints from my Ender 3 Pro fit well on the potentiometers I use. It may be that the size of the hole may need to be altered slightly to work with other 3D printers or potentiometers.

The larger knobs have a recess to help cover the nut if panel-mount potentiometers are used and will need to be printed with support.

Post printing, remove any hint of elephant's foot, stringing or blobs from the inside of the splined hole before checking the fit to the potentiometer.

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