Navigate the hidden maze by turning the two dials. This one is sized for bank notes (up to 72mm eg. €20 and less ridiculous sizes) and prints in separate pieces.

As for the locking mechanism, it prints in the "unlocked" position. Without giving too much away, to lock it turn the top dial 180 degrees before turning the bottom dial to engage the "maze" mechanism. Entering the maze is deceptively easy, escaping not so much.

https://youtu.be/H0MJJPkx5ls (same mechanism)