CPU sign in Openscad (OV chipkaart)

The design is actually used in the Netherlands as electronics payment system in buses, trams and trains (http://www.mediamatic.net/page/155204/en). The sign indicates that you can deposit or withdraw credit from you chipcard. I like the look of the original sign, except it's a bit boring after a while, so i enhanced it a little bit.

I used this polygon generator program ( thingiverse.com/thing:9290 ) to create this object.