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The next generation of large metal 3D printers, which achieve remarkable improvements in shaping speed and low-cost, high-precision manufacturing, are being rapidly introduced to the market. These printers are being utilized in the production of large parts and large products in the aerospace, automotive, industrial machinery, plant, defense, and social infrastructure sectors, as well as in the repair of metal parts and molds, and reverse engineering. In this seminar, we will explain the short-time, low-cost, high-quality shaping technologies and key points, secrets, challenges, and specific application and manufacturing cases in large metal parts, mold parts, part repairs, and reverse engineering, as demonstrated by advanced users such as JFE Engineering, Fuji High Frequency Industry, and Sanko Gosei, who have been at the forefront of introducing large metal 3D printers. What large parts and large products can be shaped and manufactured with the latest large metal 3D printers? What are the characteristics of the metal AM technology, shaping size, quality, cost, and lead time? We will provide easy-to-understand lectures for those considering introduction and for beginners who are interested.