Super Secret Encoder

Behold, the super secret encoder. Each spy has their 3D printed encoder strip. Individually they are meaningless, but stack them together and the secret word is revealed. Other words can be entered if required.

You can create your own encoders using a little Python program that runs inside FreeCAD. The code is here: https://github.com/CrazyRobMiles/Python-in-FreeCAD

Might be fun for Christmas messages. It’s never too early to start.