So far most of these 3D printers use plastic so if the area you need the part gets hot this won't work. The other problem here is you need to create the CAD drawing of the part with all of the dimensions to program the printer. Don't get me wrong here, I think it's a cool idea, just a little in-front of what can be done today. In the future I'm sure a video of the part will be enough for the system to create the basic CAD drawing (you may need to fine-tune it), and a cheaper 3D metal version comes out.