Here's my secret box, I rebuilt the original file from scratch to be able to print it in 3D, a job that lasted 3 months, but in the end I succeeded. The original file was taken from here: [https://www.freevector](https://www.freevector) .us/gear-box-with-key-laser-cut-files/.
A box that you have to find the right combination to open.
For assembly and operation see this link on YouTube:  [https://youtu.be/hATzk4DhVCE](https://youtu.be/hATzk4DhVCE)

Have fun