3D printing is an advanced manufacturing technology which is developing rapidly in near thirty years. Its advantages lie in simplifying producing process, reducing material waste, lowering production costs and meeting the spacial needs of different customers. At present, 3D printing is widely applied in various fields, such as mold manufacturing industry, aerospace, medial treatment etc. In this paper, the working principle and classification of 3D printing technology are elaborated in detail, the exiting problems are analyzed and the application trends of 3D technology are prospected in further.
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