So this is good work.
I do think that the solution is a bit overengineered. The result you’re seeing has two components:
- reduced smoke residue on the back (reduced, not zero)
- no flashback pattern
The reduced smoke residue is down to the fact that nothing traps the smoke against the bottom. The elimination of flashback is down to not having anything that can reflect the laser touching (or in very close proximity to) the rear surface.
To that end I started to fool with your idea and came up with these guys:
The gist is that you make them, slot them together into little spiky X’es, and then use as many as you need on the crumbtray to raise your material up and support it. They’re 0.3" tall, so they will work easily with .125" materials, I use set focus to make things easier.
My results are almost identical to yours, you get no flashback pattern and vastly reduced smoke residue on the rear surface. Best of all, these little guys take up almost no material and are very disposable once they get damaged during use. Just throw them on the bed to elevate whatever you like and go.
