Make your USB stick physically safe by printing a combination lock for it. The NSA won't stand a chance! This is still a work-in-progress. It does work, but there are still some things that need improvement. I would be happy to hear your ideas and thoughts. Here are the points I'll try to improve in the future: I'm currently working on a customizable version of the rings http://www.thingiverse.com/thing:193892 Again, I would be happy if you'd leave a comment. Here are the parts you'll have to print: For the case you'll have to disassemble your flashdrive and fit the circuit into the two halfs of. I printed them with support material. Depending on your drive you might have to carve it into place a little bit, because I designed it for the drive I had laying around. Now glue the two halfes and the drive together. For ABS this shouldn't be a problem. If your using PLA (like me) I recommend you using some slow-hardening epoxy glue. Worked just fine for me. Stick your printed number rings on the jacket. They must be separated by the three spacer parts, otherwise the cryptex won't lock. In the end you'l have to glue the Cover to the jacket, so the rings can not come off. Now you should be ready to go. Enjoy! !!!New customizable rings!!! There is a new OpenSCAD script I wrote. Now you're able to customize your rings. With this you can: Just download the zip-file, open the CustomizableRingRev1.scad, type in your parameters, press F6 to compile and finally go to "Design > Export as STL..."