Classic style letter scale

For those in need of a letter scale.
I really like the real-world-use-things and couldn't find a letter scale on thingiverse.

Thought about adding a scale, but it will be too dependant on printer settings, material and counter weights, so just use a (semi-) permanent marker for this.

For the small scale I used mr alligator as a letter holder: http://www.thingiverse.com/thing:13612
Had to "fix" it using Netfabb before I could import it in OpenSCAD.

I've also uploaded a version2, the la