In the following video, Motley Fool industrials analyst Blake Bos gives us the latest stories in the world of 3-D printing investing. He tells us about plans in Singapore to make huge investments in additive manufacturing as the city-state positions itself to be a major tech hub in Asia, discusses a difficult new certification that ExOne(NASDAQ:XONE) has just achieved that really gives the newly public company credibility, and highlights one report that talks about the advantage that early adopters of additive manufacturing technology will have over their competitors.