3D Systems (DDD +2.9%) and Stratasys (SSYS +4.1%) rally after Piper upgrades 3D to Neutral. Over...

|About: 3D Systems Corp. (DDD)|By:, SA News Editor

3D Systems (DDD +2.9%) and Stratasys (SSYS +4.1%) rally after Piper upgrades 3D to Neutral. Over the last 2 months, the 3D printer makers have been digesting the huge gains they saw earlier this year. (3D Systems/Rapidform)