PiP Secret Decoder Ring

This is a 3D printable, print-in-place, secret message decoder ring. It requires no supports. To use simply choose a cipher like A=F and align the top ring letter "A" to the bottom ring letter "F" and then write your coded message. The rings also include a 27th "★" character. Inspired by the old breakfast cereal prizes.
3D printing settings

Resolution: .02mm
Support: No
Skirt: 5 loops
Outer wall speed: 45mm/s