http://www.fool.com/fool/free-report/18/sa-3dprintingaudio-181284.aspx?source=isaspodft0000141 Motley Fool has a long video about 3D printing companies, Dassault System is one, a French company that is developing the technology. They mention three top companies in this $1 billion industry. What are the companies Motley Fool is introducing?