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Stereolithography is a three-dimensional printing technology that uses a laser to selectively cure a liquid resin to create a solid object. It was invented in the 1980s by Chuck Hull, who also founded 3D Systems Corporation. Stereolithography is also commonly referred to as SLA, which stands for stereolithography apparatus or additive manufacturing.

Stereolithography works by using a computer-aided design (CAD) file to create a three-dimensional model of the object to be printed. The model is sliced into thin layers, and a laser beam is used to selectively cure the resin layer by layer to create the final object. As each layer is cured, the build platform moves down incrementally, allowing the next layer of resin to be added on top.

One of the main advantages of stereolithography is that it is capable of producing highly accurate and detailed parts. This is because the laser beam used in stereolithography is extremely precise, allowing for the creation of complex geometries and intricate details that would be difficult to achieve using other manufacturing methods.

Stereolithography is also highly versatile and can be used to produce parts in a wide range of sizes and shapes. It is commonly used in industries such as aerospace, automotive, medical, and consumer products, and can be used to create everything from small, intricate parts to large, complex structures.

One limitation of stereolithography is that it is typically more expensive than other 3D printing methods such as fused deposition modeling (FDM) or selective laser sintering (SLS). This is because the liquid resins used in stereolithography are more expensive than the plastic filaments used in FDM or the powdered materials used in SLS.

Stereolithography can also be difficult to work with certain types of materials. For example, some resins may be more brittle than others, which can make them more prone to cracking or breaking. Additionally, certain resins may be more sensitive to temperature or humidity, which can affect the quality of the final part.

Despite these limitations, stereolithography remains a popular 3D printing method due to its ability to produce highly accurate and detailed parts with a high level of surface finish. It is also a rapidly evolving technology, with new materials and printing techniques being developed all the time.

Stereolithography can also be used in combination with other manufacturing techniques, such as CNC machining or injection molding, to produce parts with even greater accuracy and complexity. This is known as hybrid manufacturing, and it is becoming increasingly popular in industries such as aerospace and medical.


Stereolithography is a highly advanced 3D printing technology that is capable of producing parts with a high level of accuracy, detail, and surface finish. While it may be more expensive than other 3D printing methods, it is a highly versatile and rapidly evolving technology that has the potential to revolutionize the way we manufacture complex parts and structures.

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