This thread is intended to track the progress of 3d printing applications as applied to reproducing critical parts for limited production vehicles. Especially as they get old and parts get impossible to find. As a first entry in the story of the rise of 3d printing for cars you may enjoy:

3ders.org - Legendary Ferrari 312P's race engine newly refurbished with help of 3D printing | 3D Printer News & 3D Printing News

The Ferrari 312P was a sports car prototype racing car used for racing in 1969 and 1970. After boycotting sports car racing in 1968 to protest a rule change that had caused their 4-litre 330 P4 to be banned, Ferrari built the legendary race car 312P, a 3000cc prototype in 1969...The refurbishment of such racing engines is not only time-consuming and costly, but also very challenging on a technical level. Traditionally it would take or more but now it can be done in a few weeks, thanks to German 3D printer manufacturer Voxeljet and 3D printing technology.

and:

3ders.org -Rezvani Beast super sports car comes with 3D printed parts | 3D Printer News & 3D Printing News