This volume brings together a wide-ranging selection of papers from the 9th International Congress on 3D Printing Technologies and Digital Industry 2025 (3DPTC2025), highlighting the expanding intersections between digital transformation, intelligent systems, and sustainable industrial practices. Covering advances in VR-enabled education, teleoperated robotics, cybersecurity, blockchain-integrated manufacturing, and AI-driven analytics, the chapters present innovative methods for optimization, monitoring, simulation, and automation across industrial, biomedical, transportation, and governance domains.