Here’s an update on those stripes. I did the test that @tim1724 described, and it indicates that the pattern is not in the tile, it’s coming from the Glowforge. Maybe something about the way the power is modulated at low levels? I hope this can be improved, because these tiles look great apart from that artifact.
Here’s the file if anyone else wants to try it. 1000/100/450. Vary power, min 0.
light_rectangle.svg.zip (717 Bytes)