*2.2. Powder Sintering Technologies (SLS, SLM, DMLS, EBM)*

Basically, the SLS process uses a laser or electron beam to sinter or coalesce powdered material, layer by layer, in order to create a solid structure. The powder is placed in a container where the sintering takes place. The molten powder is supplemented with further powder supplies and levelled with a roller. The final product, covered with loose powder, is then cleaned with brushes and compressed air. SLM relies on selective laser melting to form the element, layer by layer, while DMLS, operating on the same principle, consists in the direct sintering of the metal, by laser and is used for the sintering of metal powders only [15–18,20,22,25–28,30,33].
