About the stereolithography process
    Stereolithography (SLA) is often considered the pioneer of the Rapid Prototyping industry with the first commercial system introduced in 1988 by 3D Systems.

    Stereolithography builds plastic parts one layer at a time by using an ultra violet laser to trace a two dimension cross section (layer) of the part on the surface of a vat of liquid photocurable resin.

This class of materials, originally developed as ink for the printing and packaging industries, quickly solidifies wherever the laser beam strikes the surface of the liquid. Once a layer is complete, the platform is lowered one layer thickness, resin is recoated over the first layer, and the next layer is built right on top of the first. The properties of the material allow the layers to bond to one another and eventually form a complete, three-dimensional object after many such layers are formed.

Some parts have overhangs or undercuts, which must be supported during the fabrication process by support structures. These are both manually and automatically designed and are fabricated right along with the part.
Once the model is complete, the platform rises out of the vat and the excess resin is drained.
The model is then removed from the platform, washed of excess resin, and then placed in a UV curing chamber for final curing.

Stereolithography is generally considered to provide the greatest accuracy and best surface finish of any rapid prototyping technology.
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