Found this great model on printables: https://www.printables.com/model/441984-skateboard-holder
Printed in PETG with 50% gyroid infil. I did 3 perimeters and that seems good for the regular skateboards. If I hang my longboards I will use more perimeters I think.
I appreciate the tips - I printed using the same settings you used and it turned out great! Ill get it mounted to the wall later today.