A depth sensor like the Kinect can be used as a 3-D scanner, as a sort of photocopier for 3-D objects. You move the sensor slowly around an object to scan it, and that data can be used to create a file which can be sent to a 3-D printer like the Makerbot. Then you can print it out, essentially replicating (in plastic, but still) the real-world object. But the Kinect has some limitations; it wasn't designed as a 3-D scanner, but as a game accessory, so it's sort of tricky to use with a computer. Besides that, it isn't mobile and requires power from an outlet.