This was me trying to make a somewhat decent hinge for later use in a Yoshimoto Cube (at least - I think that's the name :) ). This is just two cubes, but it's pretty fun to fidget with (especially the smaller 24mm one!).

This doesn't seem to work too well when re-scaled, but various parameters (such as box sizes) can easily be changed in the OpenSCAD file.

I used a Lulzbot TAZ 5 and no supports to print these.

Doesn't Matter

No

Works best when printed with the hinge vertical. Parts of the hinge will have to print in the air, but it still works nicely.