Researchers from Fraunhofer IAPT, one of the leading additive manufacturing process science institutions, have managed to make 3D-printing of car parts in large quantities a viable alternative to traditional methods. A step-by-step optimization process resulted in a car door hinge that is lighter and cheaper than its milled counterpart.
https://www.notebookcheck.net/3D-printing-of-cheaper-lighter-metal-car-parts-made-viable-by-Fraunhofer-researchers.595076.0.html