This document discusses several legal issues related to 3D printing including intellectual property, product liability, supply chains, and regulations. It notes that 3D printing is causing paradigm shifts that require redesigning businesses and relationships. Key topics covered include intellectual property of materials, methods, tools, and 3D printed output; potential product liability for service providers and consumers; and how supply chains may be impacted as consumers become manufacturers. The document advises working with a lawyer to navigate these issues, understand choices around open vs closed systems, and develop a roadmap to bring 3D printed products to market while managing risks.