They are still usefull for RF/Microwave prototyping on two layer PCB and non-FR4 laminates. Big issue I see is that this machine does not have a pressure foot.

They are still usefull for RF/Microwave prototyping on two layer PCB and non-FR4 laminates. Big issue I see is that this machine does not have a pressure foot. That's going to be a real issue keeping the milling depth consistent.