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 largest I can get it with my 180x200mm buildplate. I've made three stl's with all the parts to print.
The black & yellow scale is version 2. I recommend to make the weighing platform a little thinner, so it won't need as much counterweights.

Made it a work in progress again, I think it's better to shorten the arms holding the letter plate.
I would like the big scale to be good for 250 grams.
Make the scale more stable by moving the foot to the heavy side.

For the final version 3 I added s