Releasing a basic jig which can be clamped down to a bench, also original design files in case you want to fit it and use it as part of something larger.
Including a tester bit, you can use that or do a plane cut in your favourite slicer to print a tiny piece, test that threads fit, then print the full size.
My testing at %100 scale for 3 rotary tools when printed with Polymaker PolyTerra PLA:
Goxawee - Slightly loose
Dremel - Perfect fit
Milwaukee - Somewhat tight
After printing with ASA/ABS, it shrinked a little more, couldn't fit to Milwaukee anymore without a lot of force. My recommendation is to scale it up by another 2-3% if you are using ABS or PETG, try with tester piece.
If you are printing in PLA, you can get away with it at original scale, most probably.
I printed at 0.20 and 0.25 mm layer heights successfully where threads were working fine.
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