Just a neat little box I made to go around a 0.75x0.75"x1" (19mm x 19mm x 25.4mm) magnet that acts as the key to a hidden compartment I have in a shelf. When finished, there was absolutely no wiggle from the magnet inside. Prints without supports.

NOTE: You will have to pause printing near the top of the open area to insert the magnet before resuming.