This book presents selected, peer-reviewed proceedings of the 4th International Conference on Material, Machines and Methods for Sustainable Development (MMMS2024), held in the city of Da Nang, Vietnam, from September 18 to 21, 2024. The conference establishes a comprehensive understanding of the key elements that drive sustainable development, with a particular focus on materials, machinery, and methodologies. Building on this foundation, the conference seeks to provide a holistic approach that guides policymakers, industries, and researchers in aligning local technological advancements with global sustainable development objectives. This alignment is intended to support informed decision-making that prioritizes greener solutions, particularly in relation to materials, machinery, and methods. The papers presented in Volume 3 of this proceedings book highlight innovative research in sustainable machine design, energy management, and life cycle engineering for manufacturing. Key topics include MFL inspection optimization, digital twin-enabled robotic arms, 3D printing with recycled plastics, and fluxgate sensor enhancements. Robotic advancements such as differential drive systems and delta parallel trajectory control are paired with studies on AI-driven fall detection and smart electronic noses. Contributions on STATCOM-FESS control systems and energy-efficient magnetizer designs emphasize green solutions for industrial processes. The authors extend their sincere appreciation to the International Organizing and Academic Committees of the Conference for their dedication and invaluable insights, which were instrumental in upholding the high standards of this event. The authors hope that this proceedings book will serve as a rich resource for academics, researchers, engineers, and students, fostering further scientific inquiry and innovation in the pursuit of sustainable development.