I was engraving proofgrade thick clear acrylic and the glowforge caught on fire. My daughter could smell the smoke and we put it out with a fire extinguisher. I think it’s safe to say the glowforge is ruined. Not sure what to do at this point…
I had the setting set to:
Speed 350
Power Full
I’ve used these settings before, so I don’t know what happened.
Holy sh!#! WTH! Proofgrade? Hopefully GF will work with you on a replacement. Man that’s scary - no way I’m leaving mine unwatched ever. So sorry man!
Really sorry this happened! How long do you think it burned to cause this much damage?
Dang, that sucks. 
Were these cuts, scores, engraves? Curious why you deviated so far from Proofgrade settings.
He said he was engraving. I think the speed of 350 is absolutely the problem. It sure hurts to see these photos.
It was a cut and engrave. I use these settings to create a stamp stamp that I use to stamp into leather.
Wish I could say. My guess is at least a few minutes.
Sad to say, but acrylic from whatever source, will definitely burn and cause fires. It must be watched just as other burnable things must be watched.
I’m so sorry to see that, and I agree with @dklgood that the engraving speed was too slow for FP. Good luck.
I’m sorry to hear that this has happened. I see you’ve emailed, too – we’ll work out next steps there.