The MDX-20 is the culmination of over ten years of innovative product development in scanning and milling by Roland engineers. Utilizing innovative Roland Active Piezo Sensor (R.A.P.S.) technology, the MDX-20 is a precision 3D scanner, capable of scanning objects at 4 to 15 mm per second with a resolution of up to 0.002” (0.05mm). Replacing the sensor unit with the spindle turns the MDX-20 into a powerful CNC mill capable of cutting light metals, including aluminum and brass.
The Roland stuff is pretty much bottom of the line compared to other tech available today. My company has an MDX-40 that we use a lot, but it is only good for relatively small part in relatively soft materials. Useful as heck, though.
QU-BD has a 3D printer/mill that will do additive fabbing (deposition) and subtractive fabbing (standard milling) under development. Their target is to hit about $2700 for a unit that does both. The milling side is specced to handle stainless steels.