Secret decoder ring
thingiverse
Ever dreamed of encoding your secret messages for your buddies? Here's a simple encoder gadget that will make it happen, built from just under 2m of filament. All you need is a basic understanding of Caesar cipher, and you'll be away. Visit http://en.wikipedia.org/wiki/Caesar_cipher to get started. To use the decoder ring, follow these easy steps: First, print out all three parts of the gadget, then connect the small ring to the big one, secure it with glue, and add a top cap. You might need to fine-tune the cap slightly so the inner mechanism glides smoothly.
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