GreenGL
As an indicator of what car grade filament costs, I had a big printer company do some front door 240 5.25” holders.
I initially put 10 pairs in the cart in reasonably priced filler medium.
When they knew what it was for they said it will melt or break , not suitable for car.
The 10x cost was $120 odd .
The new cost was $140 odd FOR ONE PAIR.
It ain’t a cheap method at ALL.
It takes forever as well….