Thanks for the help @dklgood !
It’s possible that the material you’re printing on is too thick.
You can print on objects up to 2" thick by removing the crumb tray. However, your Glowforge can’t focus too far down, so you may need to put something laser-compatible underneath your material to lift it up. Raise it until the top surface of your material is between 1.5" and 2" (50 mm) high, measured from the metal plate on the bottom.
Our community has developed some great Tips and Tricks, and this illustrated guide might be just what you need.
Would you let us know if printing without the crumb tray resolves the trouble?