A small safe to hold a key behind a numbered lock. It's easy to get the key out if you urgently need it, but obvious after the fact when the unique lock is broken.

Remixed from a previous design to make the text easier to edit, and widen the hole to fit more sizes of numbered locks. I've found These locks to work well, but if you're cheap you could probably melt a small loop of raw filament into a tamper-evident tag too.

There are some blank pre-labeled variants included, but you can also use Customizer or Open SCAD to enter your own text. The .scad source file is included.

Print Settings

I printed at .2mm layer height in PETG, and changed the perimeters from 2 to 3 because the walls get a little thin here and could use the extra strength.