The DLS ECO Series fiber lasers are an ultra-compact and ultra-efficient solution for industrial heating and drying applications, announcing the arrival of solid-state heating. Manufacturers can use DLS lasers for modular stacking to improve preheating efficiency. DLS carries out high-power surface heating on the metal powder material on the powder bed in the metal 3D printer, reduces the temperature difference between the laser melting material and the base, reduces the occurrence of stress cracking, and the temperature field uniformity reaches only 1% to 3% float. Now the advent of 8 laser, 16 laser, and even 36 laser metal 3D printer era, printing format up to 1 or even 2 meters.