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The most widely used process in 3D metal printing is probably selective laser melting.

3D metal printing, or more precisely selective laser melting (SLM), is a cost-effective and fast method for manufacturing prototypes and is suitable to produce complex geometries. With an optimized design and many parts to be produced, the process offers enormous economic advantages. In 3D metal printing, a powder layer of 0.02 to 0.06 mm is applied to the building platform by a scraper or coater. Then the laser starts melting the first layer. In the next step, another layer of powder is applied after the building platform is lowered by exactly one layer. The laser then fuses the first layer with the next. This process is repeated layer by layer until the entire component is completed. When the last layer of the part is finished, the metal powder is removed, and the part attached to the platform appears.