There are already a couple designs on Thingiverse, in fact this version is based off of Bompe's (
https://www.thingiverse.com/thing:4147266
) but redrawn from scratch. I wanted a fully printable version without the need for any other hardware.
I suggest printing the pin and screw at 100% infill for strength. I printed the pin standing up to get better curve quality but it becomes a little wobbly so some sanding might be required.
The author hasn't provided the model origin yet.