Designed as a sacrifice part to save the front (or rear!) wheels and suspension system. The bumper has an angle to make the car jump over smaller obstacles.
I did not test with PLA but as it is made to be destroyed and or deformed to protect your car the brittleness of PLA may be good. Tested with PETG and ABS.
Still too fragile and breaks too easily (but saved the car!!! :D )
3DOn ABS or PETG
Thermal forming the thin area after print then glue it with CA or (better) epoxy. If made with ABS you may not even need to heat to fold it but PETG can be brittle with such a thin section.