So I finally did what I’ve seen many say they wanted to do, but had not found anyone had yet done: I cut a hole in the bottom of my Glowforge Basic. I constantly find I want to engrave or score on top of things that are just a bit too thick. So, since my unit is out of warranty, I increased the max dimensions of work pieces from ~20" wide x ~12" high x ~2" thick to allow for any thickness.
Because the designers added a metal plate at the bottom of the unit that is removable via screws, removing the metal plate and cutting a hole smaller than the plate allows for the hole to be filled whenever you are not cutting thick materials by replacing the plate. Makes this a much less permanent modification to your Glowforge.
Note that if you put a hole in your unit, it is no longer a Class 1 Laser Product. Also, the U-shaped clips on the bottom of the unit that attach to the metal plate via a screw are probably for grounding, removing static electricity from the fan blowing over the work area. Find another way to ground your work area, just in case. I haven’t tried anything that produces much smoke yet. I assume that the venting will not work well when the unit is in infinite-thickness mode. Pop the plate back in to keep that stuff out of your workshop for typical-thickness pieces.
Images below. Enjoy!