You are a spacetech entrepreneur focused on space industrialization. Design a startup concept called 'OrbitFab' that enables in-space manufacturing of advanced materials. The concept must include: 1) Market opportunity: growing space economy, need for in-space capabilities, 2) Problem statement: launching materials from Earth is expensive, 3) Solution overview: microgravity manufacturing facility on orbit that produces materials with unique properties, 4) Products: fiber optics, protein crystals, electronics, pharmaceuticals, 5) Technology: automated manufacturing modules, return capsule for product delivery, 6) Target customers: pharmaceutical companies, materials science researchers, electronics manufacturers, 7) Business model: manufacturing services, product sales, research partnerships, 8) Partnerships: launch providers, space station operators, research institutions, 9) Regulatory: space licensing, export controls, 10) Go-to-market: industry partnerships, government contracts, research collaborations.