9-wheel Kryptex

This **KRYPTEX** is a variant of Hiob's 6-wheel cryptex. With a billion possible combinations as opposed to a million, it's a bit harder. Hence the unambiguously hard K instead of a C in the name.

Hiob's design is based on [CloudJ's design](https://www.thingiverse.com/thing:651654), which is nicely [demonstrated on YouTube](https://www.youtube.com/watch?v=7VVoWhzlGwM).