Settings for 1/4 inch birch plywood

[jamesdhatch]

@markwal

The inner plies probably have some voids and knots. The voids can kick up a good flame and increase flash back (because you get through quicker) and the extra dense spots can prevent you from making it through

Not likely. The OP said it was Birch from Woodcraft. They almost only sell Baltic Birch (not standard Birch) plywood. That’s manufactured without knots or voids. It’s (until PG) the go-to plywood for lasers.