A wheel for decoding caesar shift ciphers. When you turn the wheel it should softly click into place at every letter.

When snapping the wheel onto the base, align the inside of the wheel to one side of the snap joint circle and gently push the joints inward until you can fit the other side of the snap joint circle inside the wheel as well.

The OpenSCAD file uses fpetrac's Simple Snap-fit Joints Library and write.scad, so you'll need to download those if you want to work with the OpenSCAD file.