Small box designed to host Paracord bracelets, but can easily be used for a range of other applications.
It must be double printed, so you have a top-bottom match.
I used a stainless steel soldering rod as a pin for the hinge, but a piece of 1.75mm filament should work as well.

I printed it in PETG, but there are no restrictions on the material you use, feel free to do your own experiments.