Industrial 3D printer maker Stratasys just bought a hot name in the 3D printing consumer market: MakerBot. The pricetag? $403 million in Statasys stock. MakerBot's desktop 3D printers cost about $2,000, while the machines Stratasys makes can cost over half a million. We talk to Stratasys CEO David Reis and MakerBot CEO Bre Pettis to hear what's behind the merger.