What is an advantage of using SLS over FDM in 3D printing?

Using SLS (Selective Laser Sintering) offers the significant advantage of allowing the creation of more complex geometries without the need for support structures, which is a limitation often encountered with FDM (Fused Deposition Modeling). In FDM, the material is extruded layer by layer, and overhangs or intricate internal features typically require additional supports to prevent sagging or collapse during the printing process. These supports not only add to printing time but also necessitate post-processing steps to remove, which can affect the aesthetics and integrity of the final part.

In contrast, SLS utilizes a laser to sinter powdered material, bonding it together layer by layer in a controlled environment. Because the surrounding powder supports the object during printing, intricate designs with overhangs or internal cavities can be printed without additional structural supports. This capability leads to greater design freedom and allows for more innovative and optimized part geometries, which can be especially beneficial in industries that require complex forms like aerospace or medical devices.

The other options present certain features of SLS but don’t hold up as advantages against FDM in the same manner. For instance, while SLS can sometimes provide a smoother surface finish and may produce parts more quickly under certain conditions, these factors are