I wanted to use the hinges here:- http://www.thingiverse.com/thing:1187867 but after printing the two halves, I couldn't get them to mate together properly, because they were way to tight. So I modified the original STL file, to make a thinner hinge.

So you need to print 1 hinge half from the link above, and then print 1 of mine. They will then fit together correctly, but be smooth enough to work.