In the following video, Motley Fool industrials analyst Blake Bos takes a question from a Motley Fool reader on Facebook, who asks: "I have researched 3D additive printing and have a small amount of money to invest as part of my 'more aggressive-more speculative' investment strategy. I already have a small position in Dassault Systems because I believe they have a good handle on the software, but I would like to invest in a hardware and services provider. I have looked at Stratasys (SSYS -0.66%), 3D Systems (DDD -1.29%) and ExOne (XONE), but all seem to be about the same as playing red or black on the roulette wheel. Now that I know a little bit about 3D printing and believe it has the potential to be a major 'game-changer,' how do I get on board?"