Print in PETG. The gaskets should be printed in TPU. Alternatively, you could try messing around with silicone. The middle support is optional for soft meshes and is not needed for wire mesh.

I found the best way to mount the mesh and make it tight is by first putting in the bolts through one side (part way) then just push the mesh into the bolt to punch a hole. Then tighten it on the other side and do the same.

Required:

• 8x M3 bolts (32 mm in length or so)
• 8x M3 nuts

I set my electric drill's clutch to 1. Setting it to 2 sometimes strips the bolt.