I'm not sure
I've never explored vacuum forming by Xometry. I know they do injection molding, but I agree - for a one-off, vacuum forming will be way more cost effective.Vacuum forming is probably the best approach for my project.
I have some hand guards and wind deflectors that I want to duplicate in dark blue polycarbonate (to match the windscreen) for the Harley... so it's super back-burner stuff.