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Another rollercoaster day for shares of 3D Systems Corp. (DDD, $60.73, -$8.34, -12.07%) as fellow three-dimensional printer ExOne sets initial public offering terms at five million shares in the $14 to $16 a share range. Piper Jaffray's Troy Jensen doubts ExOne raises any real competition concerns for DDD, however, noting just 2% to 3% of 3D's total sales overlap with ExOne. "This is noise," Jensen tells Dow Jones. "I've never heard of ExOne until they filed."