It does not stop working when the tape is cut, only when there isn't enough visible tape. Also, you can put tape on a place outside where you are cutting and reuse it. The camera isn't pointing down where it is cutting. Also, it'll correct for fairly large deviations. It is more for one-off things as opposed to madd producing something like standard CNC router. Limitless size is nice, I am unlikely to buy a 4'x8' CNC router for my garage.