> For the complete documentation index, see [llms.txt](https://www.ftcwiki.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.ftcwiki.org/manufacturing-and-assembly/additive-manufacturing/3d-printing/sls.md).
# SLS
**SLS (Selective Laser Sintering)>**
A 3D printing method that uses a laser to fuse powdered materials, usually nylon, together to create parts. This process is known to create strong, durable parts with complex geometries.
**How Does SLS 3D Printing Work? >**
* Printing: In this 3D printing process, a thin layer of powder is spread over a platform in the build chamber, preheated to just below its melting point. A laser then selectively heats specific areas, fusing particles to form solid parts while the surrounding powder acts as support. The platform lowers after each layer, repeating the process until the part is fully formed.
* Cooling: After printing, the build chamber needs to slightly cool down inside the print enclosure and then outside the printer to ensure optimal mechanical properties and avoid warping in parts.
* Post-processing: The finished parts need to be removed from the build chamber, separated, and cleaned of excess powder. The powder can be recycled and the printed parts can be further post-processed by media blasting or media tumbling.
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