Ten-way selector knob
thingiverse
This versatile selector-knob lets you pick from ten distinct settings with ease. Connect it to a potmeter for a unique digital selection experience. To achieve that satisfying detent-action, you'll need two springs from standard ball-point pens and two 5mm bearing-balls. A well-crafted M4 nut and bolt holds the entire assembly together securely. Meanwhile, a rollerblade-bearing ensures the knob stays perfectly aligned on-axis. This design also lends itself surprisingly well to use as a fidget-toy, providing endless entertainment for those who enjoy tinkering with gadgets.
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