this has been around for a while and was seemingly overlooked (?) by our opinion-makers - wrong language, wrong sites. http://www.akkuschrauberrennen.de/ the story here, this or that may help. http://www.cleantechworld.org/en/news/detail/article//der-ak kuschr.html
Great find, thanks! I just posted this: https://www.shapeways.com/blog/archives/802-3D-Printed-Racing -Car,-Powered-by-Screwdriver.html Cheers, Bart