Quarterinch nut UNC 1/4''-20

The thread of this nut is optimized for 3D printing. It was tested successfully when printed on a Prusa Mini with Prusament PETG and on Ender3Pro with PLA from DasFilament.de.

I recommend to print it in the uploaded orientation (lying flat) and with 100% infill.

It should fit to a metal quarter inch screw with a tiny bit of friction. I could have given it slightly more mechanical play, but that would have reduced the strength under high load. In my personal view this is the optimal dimension for a printed thread. 

The outer dimensions of the nut are made to match a normal UNC (unified coarse thread) quarter inch nut.

If you should need a fitting screw, you can find one here:
https://www.prusaprinters.org/prints/149604

Happy printing!