Bought a Pink Rhino Laser Cartrige for dry-fire training at home, but the box it came in was a pain to work with, and I needed a better one, so I whipped up a quick box to contain both the cartrige and the batteries separately.

Uses two 8x3mm magnets to stay closed and one or two M3 bolts as a hinge (depending on lenght)

Made for the Pink Rhino Cartrige, but I belive it should fit several others as well

Added a bottom piece with 0.2 larger holes incase the tolerances of your printer is not around the same as mine (if to large glue might be required for the magnet.)