How Does SLS Technology Work?

In the world of additive manufacturing, there are several technologies that are transforming the way we design and produce parts. One of the most versatile and powerful methods is Selective Laser Sintering, commonly known as SLS. At M Aerospace RTC and Manufactura 3D MX, we want to walk you through how this technology works and why it’s becoming a key solution in industries such as aerospace, automotive, medical, and more.

What is SLS and why is it so powerful?

SLS is a professional 3D printing method that directly competes with traditional technologies like CNC machining and injection molding. Why? Because it enables the creation of highly complex parts with virtually unlimited design freedom, without the need for molds or special tooling. This translates into cost reduction, faster development times, and the ability to produce geometries that would be impossible using conventional manufacturing.

How does the process work?

• Material preparation

  Everything begins with a reservoir filled with thermoplastic powder, typically nylon (PA12 or PA11). This powder is heated just below its melting point, getting it ready for sintering.

  
  

• Layer by layer

  A recoater blade spreads a thin layer of powder across the build platform. Then, one or more high-precision lasers trace the cross-section of the part on this layer, selectively fusing the powder where the part will be formed.

  
  

• Three-dimensional construction

  Once the first layer is sintered, the build platform lowers slightly, and the process repeats with a new layer of powder. In this way, the part is built layer by layer into a full 3D structure.

  
  

• Natural powder support

  One of SLS’s biggest advantages is that it doesn’t require support structures. The unsintered powder itself acts as a support, making it possible to create parts with overhangs, internal cavities, and intricate details.

Post-processing: a key part of the final result

Once the printing is complete, the chamber needs to cool down gradually, which can take several hours. Afterward, the printed part is removed from the powder bed and moved to a cleaning station, where excess powder is removed using brushes, compressed air, or media blasting.

The unsintered powder is not wasted—it can be recycled and mixed with fresh powder (between 10% and 70%, depending on the machine and the type of part), significantly reducing material waste.

Why choose SLS?

• Design freedom

• High mechanical strength

• Ideal for low-volume production or functional prototyping

• No need for supports

• Recyclable material

At M Aerospace RTC and Manufactura 3D MX, we work with cutting-edge SLS technology to deliver advanced and customized manufacturing solutions. If you’re working on a project that demands precision, strength, and speed, get in touch with us. We’re ready to help you take your idea to the next level.