Why 3D Systems Stock Just Popped 13% Ahead of Earnings

Additive manufacturing specialist 3D Systems (NYSE: DDD) isn't due to report its next crop of earnings for another couple of weeks -- Nov. 5, to be precise. Despite earnings being only barely on the horizon, though, and in the absence of any other news directly affecting the stock, 3D Systems shares jumped as much as 14% earlier today, and remain up 13.5% here at the 3:35 p.m. EDT mark. Lacking any more obvious catalysts, my best guess at this point is that 3D stock is reacting positively to earnings news out of Tesla (NASDAQ: TSLA), which last night reported both impressive free cash flow and also strong sales growth of 39% year over year.