I saw on e where they scaned the racecar engine bay with the engine in it for all clearances. and then printed the inconell turbo header for the inline 6 cylinder. it was done in about 3 sections due to the small 3d printer. then welded togeather. it was possiably the prettyest thing Ive ever seen printed. they made a plastic one first to be sure it was right and to send to the fab shop to make a stainless tubular unit too as they had a race they had to get to and did not know if the 3d printed inconell header would be finished in time, it's on utube somewhere... dam I wish i had one of those printers. oh the stuff I could make...if I only had a clue.