I saw somewhere the idea of taking BBQ grill mats and cutting holes in them to make a dishwasher safe overlay for a cooktop or bottom of the oven. Then I thought about what a nice job the Glowforge might make of that cutting.
I went with a Kona XL grill mat (set of 2) from Amazon. I think I could have done it with one piece had I gone with the Renook brand, but that’s water under the bridge. I did a few measurements, cut a cardboard template and to my amazement, it only needed one slight 1/4 inch adjustment to be a near perfect fit. I then figured out where the waste piece would be (inside the circle cut for a burner), and put a few .5" squares in there to test the material. I finally ended up at full pews and 150 zooms for a nice clean cut that didn’t burn the edges. Fits great, wife is happy. I think I’ll order another set and do the ovens…
EDIT - Oops. Apparently I should have looked more closely before cutting this material. The first hit on Google about laser cutting PFTE showed there are sheets of the stuff made for that purpose, so I figured it was fine and pressed on. Further comments by our esteemed group have shown that those are special laser machines with better venting than I probably have here at the house. No bueno. Instead, cut one out of draftboard and use that as a template for your X-acto knife. Lesson learned.
That “F” is fluorine which is like chlorine only more so. I would not let it inside the Glowforge for anything. Like chlorine the damage is insidious, and everywhere in the machine, and likely to get worse over time even from one cut.
That quite aside being far more poisonous as HF than HCl. Canaries were taken into Coal mines because they are more susceptible to breathing damage so if one drops dead in your house that is the same warning as the coal mine.