Friction mount for ventilation grille

These four-inch screened vents: https://www.amazon.ca/dp/B0B3JCGLMK

This hole saw: https://www.amazon.ca/dp/B0F9TDZR27

Any screws, but I'm partial to this truss-head kit: https://www.amazon.ca/dp/B0FCDVDDWF

I printed in matte PLA on an X1C, and it's a pretty snug fit. You may need to size it up a percent or so depending on your materials.