I have a 3d printer at work. If its the interior trims, I think the ones I looked at have a fair curve in both directions, so printing it may need a bit of support, which would end up taking a while and effecting the finish.
Doing the external black vents would be easier in comparison and much quicker.
The hardest part on the interior ones would be the file.
I drew up an RS centre pad for a 3 or 4 spoke wheel, but didnt get around to printing it.
Only from guesswork, so wasnt sure how close to original it might be.