Rotary tool
thingiverse
This is a Remix of the Cool Thing for Cutting Holes and Circles of the Right Diameter. I only added a small addition to the basis of the detail in order to be able to cut small holes and circles in the workpiece. On this addition, I was prompted by another similar detail: https://www.thingiverse.com/thing:5819. You can go to Tinkercad and add a detail to change the parameters: https://www.tinkercad.com/things/baYqpHo3VKH. Use as follows: Drill a 3mm hole in the workpiece, insert a 3mm bolt and tighten with a nut.
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