Every Day new uses for 3D printing are coming about. NASCAR is the latest use case for the technology. Many vehicles were having electrical issues due to a 2012 mandate requiring electric fuel injectors on all stock cars. The problem could not be easily fixed with traditional means of
manufacturing so a company called DC Electronics, and CRP USA teamed up to 3D print an electrical enclosure to fix the problem. The full story can be read here:
http://3dprint.com/7656/nascar-3d-printing/

Just goes to show us all, that yet again 3D printing, in many cases, has advantages to traditional manufacturing. Here is the enclosure they printed: