I think for 3D printing you can make the designs, print the prototypes, test fit them, adjust the design, retest, and then send off to manufacturing, using the same 3D srf file. We already have a place for production and they even do small batches.
Track / Autocross setup: Forgestar F14 (21.8lbs & 23lbs)
Front: 275/35/18 Continental slick on 18x10, Rear: 305/35/18 RA-1 on 18x11
Drift Setup: Front: 275 Continental slicks, Rear: 255 Michelin PS2 street tire
Laguna Seca previous record - 1:49:498