Oh that’s so cool. I love the ribbons of copper curling up. Might be ok for use cases like prototyping antennas - one place I’d still use a pcb mill for the the turnaround time. How is it at removing larger areas of copper?
It's probably not excellent; the grooves are V-shaped and the machine isn't stiff enough to go very deep, so you'd need to take a lot of passes. But a crosshatch toolpath might pull up extra copper on the sides and make fills quickly. I'll run some tests when I'm back home and report back! Would be neat to be able to prototype RF trace circuits same-day.