The laser sintering making use of powders, thermoplastics, metal or silica, and as the name implies, makes use of a laser to sinter the materials used for the construction of the prototype. Initially is spread a thin layer of dust by a special apparatus and the laser provides the sintering where necessary. The table lowers the quantity desired, lies another layer of dust and then it repeats. The advantage lies in the fact that you can use different types of powders and there is no need to provide supports because is the not-sintered powder which shall support the upper floors. At the end of the process the workpiece must be freed from the excess powder, which is not very complex but which takes time.