Yeah the lock is what needs iterating. It was always marginal and took several rounds of prototyping to even get to a printable state. I'd like to experiment with something like a keyed screw.

The issue with this scad file is that I built the geometry up with no functions. I tried and failed to get them working so I just pushed through, so now it is mind melting to try to refactor it. I'm hoping to one day melt a mechanical mind to get it done. Until then, it's a fun challenge prompt for these models.