Selective Laser Sintering FAQ

SLS, or Selective Laser Sintering, is a form of 3D Additive Manufacturing used to produce plastic parts.

What is it used for?

It is ideal for rapid and cost-effective production of single or short run parts with complex geometries and a high-quality surface finish, yet is also ideal for run of 50, 100 or 150 parts.

Which stage of the product development is used?

SLS can be used at any stage of the product development cycle, from a single concept part through to a functional prototype and is increasingly used to manufacture operational components.

Why is SLS so popular?

The principle advantage of SLS is its ability to deliver a complete part requiring little or no further finishing, direct from a CAD file. The process is relatively fast, and small quantities can be produced readily. SLS can produce parts with mechanical functions such as snap fit and living hinged assemblies for demonstration or concept purposes.

What materials are used in SLS?

The SLS material used by Prototype Projects is PA 2200 plastic which is specifically produced for additive manufacturing using laser sintering.

How does SLS actually work?

During the SLS process, the powder itself acts as the support for the part as each successive layer is built on and fused or ‘sintered’ to the last using a powerful laser whilst the excess powder builds up around the part.

To form each layer, the powder material is fed onto the part bed in set amounts usually less than 0.1mm, which then drops by the same set level to receive the next layer. Each layer is sintered forming an additional ‘slice’, until the part is finished.

How does SLS compare to SLA?

SLS parts can have strength and geometric properties that cannot be achieved with other additive manufacturing or 3D printing processes including SLA – though refer to Prototype Projects for specific properties you require.

Summary highlights of SLS

Similar to SLS: main difference is use of EOS system instead of 3D Systems SLS system

SLS parts can be stronger than SLA parts

Surface finish is high quality, powdery and porous until coated with sealant
Moving parts can be created e.g. living hinges
Finished part is very clean, requiring very little hand finishing. Excess powder removed by blowing or brushing

Watch our Laser Sintering video

Need advice on SLS?

For any questions relating to Laser Sintering, when to use it, the properties of parts that can be achieved, turnaround times and size options, please contact Prototype Projects.