While we do not have a “composite” 3D printing stock index – as 3D printing companies stocks are traded on many different markets – judging by my own portfolio, which includes most traded 3D printing companies, those stocks are tanking. In late 2013, the enthusiasm around the discovery of 3D printing by consumers had driven several companies to pursue IPOs and see their stock prices rapidly inflate, with industry leaders 3D Systems and Stratasys climbing to record market capitalization of several times their yearly revenues.