finally I manged to contribute my Project to the MySensors Contest 2015.
It is a 3d printable Wall Remote control for Home Automation. The Size is 55x55mm, so it fits into many "switch frames" (e.g. Berger, Gira, Merten etc.) The project consists of the 3d printed Parts, the PCB (with Eagle sources), the Sketch, an FHEM example and of cause a detailed documentation which describes howto rebuild this Project on your own. All this is included in the zip file I will provide.
Because the pdf, where the building is described precisely, is quiet long (20 pages I guess, but many photos) I don't want to put it here in the post. If you are intrested in the Project just have a look at the pdf inside the zip file. There are also more pictures included.
To finish this project you need the following equipment/skills: 3D printer, SMD soldering capabilites, AVR Programmer (to install bootloader)
Enough of talking, lets let the pictures speak for themselve:
A 3d preview of the printer parts can also be found on Thingiverse: http://www.thingiverse.com/thing:692238