3D printers are currently booming.
These 3D printers shine with the fact that such devices for self-assembly are already available for €500 and sometimes less, but hardly anyone wants to go to the trouble of assembling something like this themselves.

Since not everyone has the time and the technical know-how to assemble such a device, this would be an ideal offer for Migros-Elektronik. I can imagine that it could certainly arouse interest. As there is a huge amount of 3D data available for free on the Internet, it is not unlikely that this offer will be accepted even by the less technically experienced

Websites:
Info:
https://de.wikipedia.org/wiki/RepRap
https://de.wikipedia.org/wiki/Rapid_Prototyping

3D parts:
http://thefree3dmodels.com/stuff/characters/star_wars_master_yoda/14-1-0-2401
http://www.3dcadbrowser.com/browse.aspx?page=6&category=70
http://artist-3d.com/free_3d_models/dnm/model_disp.php?uid=2895
http://www.zxys.com/swparts/
http://www.3dcontentcentral.de/Download-Model.aspx?id=10326&catalogid=171

Modeling program free of charge:
http://de.wikipedia.org/wiki/Blender_%28Software%29
http://de.wikipedia.org/wiki/Google_SketchUp