D20 box with working print-in-place hinge. Optional hole for a padlock.
I designed it to be fully parametric and provided the Fusion 360 F3D file. You can change the size of the box, size of the cavity, tolerance of the hinge, diameter of the hole for the lock shank... all of it. To make it work for you, open the F3D file in Fusion 360, go in Model mode, Modify --> Change Parameters.
No supports. Nothing special. Slice at 0.2mm layer height and print it.
Designed for a Master Lock 141, available at Lowe's and Home Depot. The Fusion 360 file is fully parametric, so you can make it fit any lock.