The locksmiths I work with needed a new way to sort the pins for lock cores. All the available items were vacuformed with square pockets, which were hard to get a single pin easily. They had some older wooden ones with half-sphere pockets, so I recreated it to print. 

I remixed it from scorf's great parametric box and added the insert. It works great with 20% infill, and I glued the halves together with 3DGloop. I used brass stock as the hinge pin, which seems to be holding up well.