A side project I have been working on for a week or two now as a future prop for our gaming is this Cryptex design. The original files are available on Thingiverse, both the remixed version (http://www.thingiverse.com/thing:3090603) and the original version (https://www.thingiverse.com/thing:3074829).
I used Hatchbox Black PLA for the interior mechanics, and Prusament Galaxy Silver for the exterior. Printing is with 0.2mm layers, and 15% infill. The final assembly did encounter some challenges – not all of the layers lined up completely evenly – but the piece does function and turn correctly.
Not sure when or how I will use it, but since the combination is customizable, I can adjust to the situation as needed. In the meantime, I have it storing a few nuggets of chocolate, for if and when the kids are able to operate it properly.