Canaccord Genuity initiated coverage on ExOne (XONE) with a buy rating and a 55 price target. The research firm cited its focus on the fast-growing metals field of 3D printers. Larger rivals Stratasys (SSYS) and 3D Systems (DDD) focus on plastics-additive systems. ExOne's IPO priced in Feb. at $18. Shares jumped 11.6% to 47.89 after falling 3 straight sessions from its May 31 record high. Stratasys rose 4% and 3D Systems rose 5.6%.