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Existing domestic 3 d printers are metal laser print head, because the energy of laser print head is lower, the metal powder, high requirement, print out the parts prone to defects such as osteoporosis, yield is low, cause the increase in the cost of printing parts, and plasma print head can widen the requirements of the metal powder, can solve the defects such as print parts loose at the same time, high yield, can greatly reduce the printing cost. Now only individual countries in Europe and the development and application, this will be the second generation of the core parts of the 3 d metal printer will provide technical support for the expansion of metal 3 d printing, at the same time is also the world 3 d metal top printing technology.