Most of 3D printing used SLM, SLS. 3D Printing metal material include iron alloy powder(stainless steel powder, 18Ni300, H13, M2), aluminum alloy powder( AlSi10Mg, AlSi7Mg, AlSi12), Nickel alloy powder( Inconal 718,625), titanium alloy powder( Ti6Al4V), Cobalt alloy powder( CoCrMo,CoCrW), Copper alloy powder (CuSn10).