It's nowhere near as comprehensive as a hardware store nut and bolt thread checker, but if you've got a 3D printer and just a handful of fastener sizes you commonly work with, this is for you. Prusa Printers has uploaded files for this metric screw measuring device, with a range from M2 to M5, from 4 to 50mm:

It's admittedly not an ideal design, but whaddaya want, your money back? Grub Screws For Door Handles

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