I made this airbrush booth gasket to create a better seal between the fans and the exhaust.  It fits under the plastic hose adapter mounted to the booth.  I noticed small amounts of paint residue starting to form around the edges and this fixed it for me.  This is only known to work with the booth shown in the photo but the style seems to be common among airbrush booths.  This should be printed in TPU.  I used TPU 95a for mine.