Staples (NASDAQ: SPLS), General Electric (NYSE: GE), and Daimler are all getting into the 3-D printing game, which are some big names to be entering the industry. This may suggest that the 3-D printing revolution, which many thought would come eventually but maybe further down the road, is closer than we think. In this video, Motley Fool industrials analyst Blake Bos talks us through what aspects of the 3-D printing business these companies are getting into, and what it means for the current giants of 3-D printing, 3D Systems (NYSE: DDD) and Stratasys (NASDAQ: SSYS).