Selective Laser Sintering (SLS)
The models are printed layer by layer with a laser that draws thin lines in the powder, which melts and bonds it together to form a thin layer of the model. After a layer is printed, a new layer of fresh powder is spread over the surface by a roller. The printer has a print chamber which is heated to just below the melting point of the powder. The laser beam adds the extra energy to melt the powder, and forms a solid model. After a print job is finished, the result is a big block of heated powder with the printed models contained inside.
![SLS](http://3duct.com/wp-content/uploads/2017/05/SLS.png)
![P369 & P110_02](http://3duct.com/wp-content/uploads/2017/05/P369-P110_02.png)