3-D printing stocks down as H-P eyes market By: MarketWatch March 20, 2014 at 10:22 AM EDT Shares of 3-D printer makers slipped Thursday after Hewlett-Packard sends a strong signal that it was considering entering the market. Read More >> Related Stocks: 3D Systems Corp Amazon.com Apple Boxx One Year Target Duration ETF Cisco Systems Hewlett-Packard Microsoft Stratasys Ltd