Pascal and his students made a replica of WW2 Enigma encryption machine with 3d printed mechanism. It is a very interesting project and you will learn something more about encryption.
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All the code, files and instructions can be found at:
https://pascalr2blog.wordpress.com/3d-printing/enigma-replica/
https://www.thingiverse.com/thing:1813308
https://pascalr2blog.wordpress.com/3d-printing/enigma-replica/how-it-works/
Here are two videos that explain Enigma machine and the science behind it:
All the code, files and instructions can be found at:
https://pascalr2blog.wordpress.com/3d-printing/enigma-replica/
https://www.thingiverse.com/thing:1813308
https://pascalr2blog.wordpress.com/3d-printing/enigma-replica/how-it-works/
Here are two videos that explain Enigma machine and the science behind it: