In the following video, Motley Fool industrials analyst Blake Bos looks at the most important news coming out of the 3-D printing world right now. He discusses 3D Systems' (NYSE:DDD) new partnership with Staples (NASDAQ:SPLS) and tells investors what to follow to see how well these printers contribute to the company's bottom line on the retail end. Blake also looks at General Electric (NYSE:GE) and discusses this massive company's plans to incorporate additive manufacturing into its production line.