I chose wool felt because I figured that the worse thing that would happen is my things would smell like burnt hair (they did a bit). Synthetic wool seems to be made from polyester which a quick search of the internet seems laser safe. I’d love to hear other’s experiences.
FWIW, Ground Packing Felt is something entirely different from crafting felt. It is used when putting down a gravel base like for a driveway or a road to prevent your fill from driving too deeply down into the ground (and requiring even more fill on top).
Thanks @konkers! I used the settings for a tiny felt project I’m working on. I didn’t realize the felt would shrink during the cut, but it sealed the edges nicely. I ended up bumping the power to 50 because the pointed areas didn’t quite cut all the way (I need these for the negative space, so the bottom right image is the final).
Top is first try, bottom is second. This saved me an hour of cutting felt and cussing; these are only about 1.5 inches high. Total glowforge time was 20 seconds