There was not a quiet moment Wednesday for Sector Leaders, with some dramatic moves appearing amid the broad market's upside reversal. 3D Systems (DDD) shot up 3.12, or 7%, scoring a new 52-week high. Volume nearly doubled from its average pace, its third-straight overactive session. What had begun as a mild, low-volume climb from the 10-week moving average turned into a ferocious rebound two days ago, when the company unveiled two