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stereolithography (3d printing) (STL)

Stereolithography (STL) is a process for rapid prototyping of 3D models. In this 3D printing technique, the 3D model is built up layer by layer, as in laser sintering( SLS) or selective laser melting( SLM). Unlike other 3D printing processes, stereolithography uses liquid, light-sensitive epoxy resin that hardens upon exposure to light.

In stereo lithography equipment, Stereo Lithography Apparatus( SLA), the 3D model is dipped into the epoxy resin and then a layer of the 3D model is projected onto the surface of the epoxy resin with a laser. After the layer solidifies, the model is displaced in the epoxy resin by the height of one layer.

3D model of a lower jaw in stereolithography, photo: caesar

3D model of a lower jaw in stereolithography, photo: caesar

This step allows the liquid resin to collect, which can then be cured again with a laser beam. The prototype model is thus built up step by step from the bottom to the top. For complete curing, the 3D model is post-exposed in an exposure chamber.

3D printer for stereolithography, Photo: Formlabs

3D printer for stereolithography, Photo: Formlabs

The STL process of stereolithography is suitable for high-precision 3D printing for sculptures and prototypes that can be used for marketing purposes and photo shoots. The technique can also be used to produce small batches with complex structures. In addition, the STL process is suitable for rapid prototyping and small production runs. The resolution accuracy is less than 0.01 mm, which is higher than other 3D printers. In addition, stereolithography can be used to produce extremely complex components and components for microsystems technology that cannot be manufactured using other 3D printing technologies.

Informations:
Englisch: stereolithography (3d printing) - STL
Updated at: 27.10.2021
#Words: 259
Links: process, rapid prototyping (RP), indium (In), 3D printing, layer
Translations: DE
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