Motley Fool analyst Blake Bos shares insights from the latest Wohler Report on the state of the 3-D printing industry.  The current market shares of 3D Systems (NYSE:DDD), Stratasys (NASDAQ:SSYS), and The ExOne Company (NASDAQ:XONE) are discussed in the video below.

Blake explains why the rate of growth of the overall $2.2 billion 3-D printer market in 2012 is a key metric.  Growth forecasts are provided to help investors understand and monitor stock valuations moving forward.

Lastly, Blake reveals the biggest misconception regarding 3-D printer sales figures to help investors focus on the market segments that will have the greatest impact on future earnings.

Blake Bos has no position in any stocks mentioned. The Motley Fool recommends The ExOne. It recommends and owns shares of 3D Systems and Stratasys and has the following options on 3D Systems: short Jan. 2014 $36 calls and short Jan. 2014 $20 puts. 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.