Great question and good discussion! When you remove the material from your Glowforge, it will have a faint smell that may or may not be pleasant, depending on the material. Leaving the material in the Glowforge will minimize this, as the fans will air out the material, and the smell will disappear with time.
You can see some more ideas from the community here: Tips For the Inexperienced
And, since this discussion is providing some new ones, I’m going to leave this thread open for a couple more days to see what arises.