I did a set in ASA from the files online and they were OK. The thickness of the guard, at 2mm, was thin enough that the ASA could flex to the rounded contour of the wheel well but the holes for the scrivets were too small so I had to drill them out a bit and the wall thickness in the recesses was so thin that I could easily poke through if I wasn't careful. So I rebuilt the parts making the guard 3mm thick, opened the holes up to 9mm and made the recess wall thickness 1.5mm. I printed them from 95A TPU this time. I have to print TPU very slowly to keep the quality acceptable so it took 2 1/2 days to print all 4 parts on one plate. But in the end they turned out great. Hopefully this helps with the stones.