Summary

This dial shows the characters A-Z. It is 3" in diameter.

V2 is 2.25" in diameter and thicker, thus more stable.

There is a third version, which features an arrow instead of a pinhole to visualize the currently selected character, while showing the whole alphabet at all times.

For best reading clarity I recommend printing in a bright filament and coloring the characters with a marker or similar!

For customization options, please refer to the remixed Thing: http://www.thingiverse.com/thing:1421725