Knob 6 mm axis - 29/34/39 mm Coin version
thingiverse
You might consider a knob for a modular synth that's a bit large, but it's definitely possible to press in coins if you prefer. They come in three different sizes: 29 mm for the one-cent option, 34 mm for the two-cent model, and 39 mm for the five-cent variant. Each size is designed to fit snugly onto a 6 mm axis.
Download Model from thingiverse
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