just wanted to say i made an attempt at printing this on a thing-o-matic but it didn't really work. the thin walls made it kind of tough to print, and the irregular gcode generated by skeinforge made it hard to get the nuts in place. it looks like you have a nicer printer that made it easier :)

The nut is 1/4-20. Traditionally the screw on the camera tripod mount is not exactly threaded 1/4-20 but it is close enough to work. Most modern ones are actually threaded 1/4-20 since the tools to manufacture it are cheaper. Even tripods and cameras from "metric countries" use 1/4-20.

The four other screws are plastic thread forming screws, which cut threads into the holes but you might be able to use wood screws if you don't mind damaging the case a little more.

If you have trouble finding the fasteners locally, send an email and we can probably work something out.

Out of curiosity what kind nut is that? Is it metric?

I love that minimal Design! Props!