The most common metal 3D Printing technology is Selective Laser Melting (SLM). It is used for prototypes creation and mass production. The range of materials used are wide and includes steel aloys, nicel, cobalt chrome, aluminium, titanium, etc. SLM is similar with SLS technology. Both technologies use powder, and a laser sinters the powder together creating layer by layer the object. The surface finish of the sintered parts is rough and, depending on your requirements, may need some post-processing. It is also common to machine parts to achieve fine tolerances and finish fine features, surfaces, and holes.
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