Hole expansion calibration model

thingiverse

Cura finally got a setting that lets users calibrate the hole size of models so they no longer come out undersized. I imagine other slicers might have something similar. Since this value changes from filament to filament, I made this small test print with a 10mm, 20mm and 30mm hole in it to help calibrate that. **How to do it** - Set any value of hole expansion that isn't 0(I'd say start at 0.05) - Print this model using that setting - Measure the hole with digital calipers(use the pointy jaws on the back of your caliper to measure the inside of holes) - Take your expected hole size, divide it by your actual hole size and use that to find what to multiply with to get your new value. ***Example:*** Your hole measures 9.60mm and it's supposed to measure 10. Divide 10 by 9.6 and multiply your hole expansion value by the result. 10 divided by 9.6 equals 1,04166666 0.05 times 1,04166666 equals 0.05208, rounded down to 0.052 - Print again and make minor tweaks to get your hole completely right - Save the value in your material profile(or how you prefer to keep filament-specific values)