Caterham CT05 3D printed car body. "

"Most F1 teams use 3D printed parts
in an industry where you need to assess something and change it as frequently as once a week, you need to be able to produce those parts frequently. Unlike most consumer 3D printers, these parts are made out of steel and not plastic. Previously, these parts had only been used in testing but in 2014 they will be used on the real car."

Text Source: http://www.news.com.au/technology/design/six-things-you-didnt-know-about-formula-1/story-fnjwucvh-1226856241458