MFSC 300W single-mode continuous laser (3D printing), based on modular design, has excellent beam quality and extremely high stability. Using intelligent air cooling, compact structure. The laser power is continuously adjustable, using optical fiber with QBH head output, and can be used with laser processing heads, galvanometers, etc. for system integration with robots, machine tools, etc., to provide mature and reliable welding and cutting applications for 3C, hardware, medical, new energy and other industries solution. At the same time, a metal 3D printing version is available, with higher beam quality and more stable laser power, which can meet the strict metal 3D printing needs in the fields of medicine, aerospace, and automobiles.