Piper Jaffray analyst Troy Jensen upgraded Stratasys to Overweight and raised his price target for the shares to $31 from $19. Feedback from Stratasys resellers indicates the company Q4 exceeded expectations with respect to system demand while material demand appeared slightly ahead of expectations, Jensen tells investors in a research note. Further, growth assumptions for the next year "are the best we've seen in several years," adds the analyst. He also believes the recent launch of elastomer materials should help accelerate growth for Stratasys' "high margin" materials business and potentially boost sales of F123 systems.