Look at this picture
There has been quite a bit of talk about prefilters. They are a great idea for prolonging the life of an expensive filter!
Here is one that I remember:
I saw that but these look like they were made and cut for the Glowforge and fit perfectly in the upper slot and look washable ? Its funny how they are pictured with the unit and there was a rumor they would be available at some point. Would love a comment from Glowforge themselves. These filter cartridge’s are causing me to raise my costs