My original Glowforge was replaced with a refurbished model to address a camera/alignment issue. The replacement unit works great, except I feel it creates significantly more ash/soot during cutting than the last model. I find myself having to constantly clean the glass, camera, lenses, etc. much more often than before. Also more ash remains on the material afterwards, and there are ash fragments along the top edges of engraves that I now have to scrape off. I did not have to do this before.
I’ve checked that the exhaust seems to be blowing with the approximate same force as with the prior unit (just put my hand in front), and I can’t find any obstructions or problems with the exhaust fan or hose.
If you are cutting more Draftboard recently than you were before, be aware that even though it is Proofgrade, Draftboard results in a lot more smoke and residue than any other Proofgrade (like plywood or hardwood for example).