This print is an easy 3-part assembly. You don't need any supports or glue. Just print and click it together.
Perfect to test your printer or just as a fidget on your desk. It makes use of a spring gear that will bring back the knob that you are moving back to the center every time. I can even use it with one hand and reload with the other hand.
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License: Attribution-NonCommercial-NoDerivs CC BY-NC-ND