I went to order the air filter (finally have the funds) and it has a 3-4 month lead time which usually means 6-12 month lead time :P. Has anyone been successful with another model/brand? I have been looking at this one: (thoughts)
[OMTech XL-300 Fume Extractor with 5 Stage Air Filter, Wheeled Smoke Absorber & Purifier with Remote Control, 330W Air Purifier for Laser Cutters & Engravers Soldering Stations CNC Machines - - Amazon.com]
Easy enough to make an 11" circle with a 4" hole and I considered it. However, going into the center of the filter, that area would fill fast, and much slowed to the rest. I was thinking a round cap like the other, with a 4" part coming in parallel to the sides creating a spiral that might even get the biggest stuff off to the sides. I also have a washable filter I got from the grocery that I put in front to peel off the biggest and stickiest bits.