SLA (stereolithography) is the first of the additive manufacturing processes collectively known as “3D printing”. A special type of liquid plastic is used that reacts with ultraviolet (UV) light to form a solid. An object is created by slowly curing one layer at a time using a programmable UV light source.SLS (stereo laser sintering) is also a method for making rapid plastic prototypes, but in this case, the raw material is a fine powder.

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