I used this platic Rivet for my Toyota Avensis. Material is Polypropylen and i have no ide if this will last. In summer 2020 i will go on a climbingtrip and then this will prove it's value.

Need other dimensions for other usecases?
*.f3d included for you to adapt.

Print instructions

Should be possible to use 0.6 and 0.4 nozzle.
If you use Polypropylen use packing tape made of plastic on the printbed. No heating on the printbed.