In the video below, Motley Fool industrials analyst Blake Bos takes a look at news that investors need to know about in the 3-D printing industry that's coming out of the Rapid Ready conference, a major event for the industry. Blake discusses comments made by Terry Wohlers at the conference about just how much the industry as a whole has grown over the past year, and what those growth numbers have been for some of the most prominent players in the space. He also talks about why the explosion in media coverage of 3-D printing has given the public the illusion that this was an industry that erupted overnight. Blake tells investors why they might need to be careful in this space; he discusses the price to sales ratios for 3D Systems (NYSE:DDD), Stratasys (NASDAQ:SSYS), and ExOne (NASDAQ:XONE), and shows investors why these stocks look priced to perfection at the moment.

Blake Bos has no position in any stocks mentioned. The Motley Fool recommends 3D Systems, Stratasys, and The ExOne Company. The Motley Fool owns shares of 3D Systems and Stratasys and has the following options: Short Jan 2014 $36 Calls on 3D Systems and Short Jan 2014 $20 Puts on 3D Systems. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.