The next step was to create a surface that the air filter could clamp onto. I laser cut acrylic donut shapes with an OD that matched the ID of the air filter so it could clamp on and an ID that matched the OD of the lamp bulb socket. Now this piece could also be used to mount the bulb socket. I knew that I wanted a frosted surface finish on the exposed surfaces of the disk so I experimented with a couple methods. The first was sanding with high grit sand paper to mark  the surface. Going back to the first project I was able to create a textured finish by heating the acrylic enough and so I also tried that. The heating up method did not work with clear acrylic. I imagine it was because of the dies in the black acrylic that allowed that to happen in project 1. Therefore I used the sanding method. to do this I wet sanded the side edges of the four disks to be used as well as the bottom surface of the bottom disk. First with 400 grit sandpaper, then with 600. This gave a nice frosted finish on the disks that didn't look completely scratched up.