The company posted a double miss in its latest reported quarter.Barely over a week after it released (very) delayed first-quarter results, 3D Systems (DDD -8.15%) went back to the printing presses to publish a new set of quarterlies. Investors weren't impressed with the 3D printing company's Q2, as the stock traded down by almost 19% over the course of this week, according to data compiled by S&P Global Market Intelligence.Lower revenue, but narrower net lossOn Thursday, 3D Systems unveiled those Q2 figures ...