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 (DDD -0.86%), Stratasys (SSYS -0.20%), and The ExOne Company (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.