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I have experience creating a few parts from 3d prints for driveline components... But your final pieces will need to be metal. I use the 3d prints as prototypes, then take them to a metal caster who will use the "lost wax" process to create a ceramic mold to pour metal, stainless in my case. Here's a picture of before and after. Left object is 3d print, regular PLA, right object is SS cast.
There's a little bit of a shrinkage factor, so I sent a few different sizes the first time for experimentation. Certainly some post-finishing was required, but worth every minute. Not as perfect as machining, but WAY less money. I used a company in Loveland, CO called Colorado Art Castings, but any casting company is getting requests like this these days. I saw alot of car parts on their shelves, emblems, manifolds, etc. Good Luck!

Gas Composite material Auto part Cylinder Metal
 
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