Two years ago, Fool contributor Brian Stoffel wanted to choose one 3-D printing stock for his growth portfolio. He chose Stratasys (NASDAQ:SSYS). Even though Stratasys stock has underperformed rival 3D Systems (NYSE:DDD) since then, Stoffel still thinks he made the right decision.

In the following video, watch as Brian explains what Stratasys' recent mergers mean for investors, and why he's thinking about buying shares of the company for his real-life Roth IRA.

Fool contributor Brian Stoffel owns shares of 3D Systems and Stratasys. The Motley Fool recommends and owns shares of 3D Systems and Stratasys and has options on 3D Systems. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.