The Contrarian View? Gabelli & Co Upgrades 3D Systems By: Benzinga via Benzinga February 04, 2015 at 11:25 AM EST Sshares of 3D Systems Corporation (NYSE: DDD) fell more than 10 percent Tuesday after 3D printing rival Stratasys, Ltd. (NASDAQ: ... Read More >> Related Stocks: 3D Systems Corp Stratasys Ltd