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Metal 3D printing molds are feasible. At present, the accuracy of metal 3D printing can be controlled within 100 microns, and the density can be close to 100%. In fact, the larger the volume of the metal part that needs to be printed, the relative reduction in accuracy and density. If the volume of the metal part is small, the accuracy and density are quite high. In some metal parts with small volume, discontinuous production, and complicated inner cavity shape, 3d printing is still more advantageous.