i thought about that a little, but i would worry about what kind of plastic that is any time it got hit by a laser running through the material. and somehow i don’t think there’s an MSDS that comes with it.
I end up making my own by driving a bunch of screws through a flat piece of wood. I use 3 screws spread out over the base of what I’m finishing.
My reasoning for this approach is that I want the stand to contact with the piece I’m finishing as little as possible. The screws make for a nice fine point that is very hard to see when I throw on wood finish. I usually finish the bottom of the piece, let it dry and then turn it over and finish the top so it any fine points you can barely see.
these pyramids are 99% styrene or HIPS. small chance they might be abs. would not be worried of pvc at all . (I work for a plastic sheet extrusion company).