A storage case for 3.5" bare drives. This holds a bare drive comfortably, and is just big enough to hold a drive wrapped in an anti-static bag.
Added 2.5" drive cases for 7, 9.5, 12.5 and 15mm drives. Untested, so let me know if I screwed up any dimensions.
Also, tweaked the "clamps" to make them a bit more grippy.
Use a wall thickness of 1.2-1.6, and there won't be much infill required as the walls are a multiple of the nozzle thickness.