A very useful technology in 3D printing is SLA. SLA is an abbreviation of Stereolithography. It is a main technology that also include photopolymerization being used for producing a solid part from liquid material. It requires using supporting structure, as it is attaching the part to the platform that elevate the layers.
The technology make use of a vat of liquid ultraviolet that is curable photopolymer resin along with a laser that is ultraviolet for respectively building the layers of object. In every layer, this laser will beam traces a cross-section, alternatively layer of pattern of the part that is on surface of liquid resin. It then expose the cross-section (layers) to ultraviolet laser light, which both solidifies and cures that pattern that is traced on resins, and then joins it to the layer that is under it.
Once the pattern is traced, a SLA platform that elevate the layer will descends by a distance that is equal to thickness of one single layer, which is typically between 0,05 mm to 0,15 mm. Then, a blade that is resin-filled will sweep across section of that part, in other to re-coat it with fresh materials.
On a new liquid surface, a subsequent layer pattern will be traced, so it could be join to previous layer. A complete 3-dimensional object will be formed.