What material are car rearview mirrors made of?
It could be ABS or Nylon?
Mine says >PP< : polypropylene
Yeah. Non-impact interior areas are generally PP. Dash and door trims are usually PP too. It’s less expensive than ABS by about 25%. Car manufacturers are always looking to save pennies on components. It adds up. There are a lot of parts in a car, and a lot of cars being made.
Almost all plastic automotive parts have the plastic type embossed someone on the part. There’s actually a standard for it, ISO 11469, though there’s no legal requirement to follow it, most do.
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Thanks, but, What is PP? 
Most of the molded aftermarket parts and OEM parts are actually ABS and marked so. As far as fabricating in filament. PP can be pricey.
When I had to fabricate a bracket for my side mirror which was going to see temp extremes, lots of shock and vibe and salt spray, I ended up using PA Nylon. As far as nylon goes, it’s fairly easy to print and it gave me very good results. In my use case, I was looking for something that would flex and withstand temp extremes. PP is reputed to be king at flexibility but I went cheap. So far the PA bracket has held up well. This winter will tell.
This is the Sunlu filament I used but I fear it may have been discontinued and I got it at clearance prices because it hasn’t come back in stock. But look at the specs and you’ll see why I chose it for a mirror bracket. I’m sure there is other PA filament out there that will do the job.
I paid $27 for it back in April of this year.
If you’re in australia etc I might even opt to use something like PA6-CF which will resist nearly 200C before giving up. Looks fancy for a car, too. Being at the roofline of the interior means it is subject to the hottest greenhouse environment your car can produce