When Cutting the hole in my custom printer housing I noticed my hole wasn't the cleanest circle, so I designed this to cover the imperfections and help direct air into the filter. This fits to the mounting of the 3D-UPFITTERS 80mm carbon air filter although I may have had to use longer screws (been a while so I don't remember). This one was printed out of PETG on my Ender3 S1 Pro. It took 2:39min to print with PETG. There is also a version I designed with curved edges instead of straight edges leading to the fan.
The author marked this model as their own original creation.