Mitxele.com discusses making a hinged brass fidget toy.
A friend of mine has a fidget toy called an infinity cube. I saw it (from a distance) and figured I’d try to make a brass one.
I had a rough idea of how big it should be. I got some brass stock that was three-quarter inch square profile (~19mm), and in the interest of saving time I decided to leave most of the surfaces unfinished. Already this seemed a little on the large side, but I later found out the plastic toy is even bigger than this, pretty much dead-on 20mm cubes.