“3D printing has the potential to change everything” says a former ship engineer. First used in the late 1980′s, this technology has been called Rapid Manufacturing, a term coined by inventor S. Scott Crump who later went on to start Stratasys[NASDAQ:SSYS] I has also been called additive manufacturing or stereolithography, more complicated terms for similar technology created at about the same time by 3D Systems [NYSE:DDD] founder Charles ‘Chuck’ Hull. While both companies have traded publicly for a decade or more, the technology has gained traction in recent years and has launched both companies into an organic growth spurt, prompting acquisitions and strong numbers, with little to no debt. While these two companies are the leaders in market cap, the entire publicly traded market cap for 3D printing companies is comparatively small, roughly 2 Billion USD. And many companies that work in this space are still privately held.