thingiverse
Disk Decoder Ring
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Unlike my Caesar Cipher decoder ring ( http://www.thingiverse.com/thing:14891 ) this is a simple substitiution cyper. Based on the Ring-A-Thing.
After making this I found a picture of the decoder rings from radio shows in days of yore. This isn't exactly like that. It works, tho to decode and encode messages like the one below.
2 5 19 21 18 5 20 15 4 18 9 14 11 25 15 21 18 15 22 1 12 20 9 14 5!
EDIT: Added a facedown version of the letter disk without sloping inside and a blank version of the disk, also face down. It is left to the user to make a 2D printable letter disk to fill it with.
EDIT: Added a png suitable for printing on paper and cutting out, possibly using http://www.thingiverse.com/thing:17645 . What it is not is scaled so the outter ring is 37mm across. Helping any way I can.
Instructions
You only need to print one of the disk pieces and one of the rings sized to your finger. When assembling put the peg in the ring, then the disk on before the dial.
This requires an extreme amount of detail to print and probably won't work on a normal FFF 3D printer.
Direct link to the original creator's page
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Model Specifications
Frequently Asked Questions
How do I download Disk Decoder Ring?
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
What 3D printer can I use for this model?
This STL file is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
Is this 3D model free to download?
Yes, this model is available as a free download on thingiverse. Some creators accept tips or donations.
Can I modify this STL file?
Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.