3D Systems (DDD -13.49%) is not heading into the Thanksgiving holiday on a high note. The 3D printing specialist reported its latest set of quarterly results; as these missed on both the top and bottom lines, the market reacted negatively. Investors pushed the company's share price down by nearly 13% on the day, a far steeper fall than the S&P 500 index's 0.4%.A tough third quarterAfter market close on Tuesday, 3D Systems published its third-quarter figures. These showed that the company's revenue for the p ...