Remixing the original larger hole version because the original was only 1mm high making it very flimsy. The holes didn't match up with any of the 120mm fans I had. Also the mesh was just lines over each other, it wasn't a real mesh.

This is 3mm, the mesh is an actual mesh, the holes match 120mm fans, and I added some numbers next to the holes for identifying the holes.

For anyone wondering as I did, despite being a very dense mesh, air passes through easily, so don't worry about this reducing your 120mm fan's airflow.