The motors inside are likely not powerful enough to run a CNC machine, but could be useful for something like a reprap, or hot wire cutter. Many printers have guide rods and bearings that are of superb accuracy. If you fiddle around with electronics/robotics, grab the motors, and possibly the encoders if you can rip them out without too much effort. Overall, I would say, crack it open, and see what looks interesting/useful.