Rugged Labyrinth Geocache

I put out a geocache based on sneakypoo's labyrinth puzzle design, but before long the 'nub' on the cover wore off and the cache would slide apart on its own. This cache is a ruggedized version which uses a much "chunkier" nub, and so far has held up well.

There's a recessed loop in cover which allows it to be hung from a nail using a cable tie.

OpenSCAD design files are attached. Most of it is parametric, and the cache "as is" has been successfully printed and tested. If you change the ma