Rapid prototyping PC boards

Hey guys, some thoughts on doing quick-turn PCBs. I have access to a CNC mill at the moment, and I’ve been messing with PCB-GCODE to make PCB layouts in Eagle and then make them on the CNC mill.

I have done some test runs on plywood with an end mill, but I’m working up to getting the etching bits on the actual copper. In the meantime I’m going to try to write up any gotchas I come across with this method.

There are some other methods using a laser cutter and black paint, but it looks like it’s not that reliable since there is paint residue left, and you still have to etch. I think I’d rather just use toner transfer paper in this case. Or silkscreen, which is still my favorite.