Made it a bit smaller and added it on top of a square DUPLO block.
The second version is propaganda for Linux and GULL, a Swiss GUN/Linux user group.
A 3rd and 4th version uses a 4x4 block and allows to put Duplo persona on top of it ....
Printed with translucid PLA on a FelixPrinter. Any filament printer can do this, but the slicer ought to able to compute brides (flat roofs).
Resolution 0.25mm, use slightly fatter layers than usual (roofs will be prettier).
Use a heated print bed for the 4x4 version. You also can try the version with holes (eases tension).
To get a "blank" DUPLO block if you want to play with different letterings, etc.: http://www.thingiverse.com/thing:2106