3D Printing companies as a investment.

I am looking into 3D Printing companies to invest in. What is yor opinion on this sector of the market. I think that are a couple good companies in this area, I.E. Autodesk (NASDAQ: ADSK), 3D Systems (NYSE: DDD), and Stratasys (NASDAQ).
Do you think that this may be a good direction to go or does 3D printing seem risky ? Your imput would be appreciated. Thank You. Roy Pradelski

Terry Says:  I never recommend individual stocks, but I agree that 3D printing is only going to grow in the future.  Then again, you and I are not the first ones to think that, thus the P/E ratios in this fast-growing segment!