When a part needs to be tough and durable without the cost of injection molding, SLS is often the right choice. Selective Laser Sintering is one of the three major 3D printing processes, and it excels where other technologies fall short.
Comment fonctionne SLS
SLS uses a high-powered laser to fuse powder particles—usually nylon—one layer at a time. Unlike FDM, which builds with plastic filament, or SLA, which uses liquid resin, SLS melts solid powder into solid parts. The powder that isn’t fused becomes support material, which means no separate supports are needed. That’s both faster and cleaner.
The process starts with a heated build chamber filled with nylon powder. The laser traces the cross-section of your part, fusing the powder. The build platform drops slightly, and a fresh layer of powder is spread across the top. The laser repeats. Layer by layer, a fully solid part emerges from the powder bed.
Why SLS Stands Out
No support material to remove. Because unfused powder supports overhangs and complex geometry, SLS parts come out clean. That saves labor and finishing time.
Durable, functional parts. SLS nylon is tough and flexible—it survives drop tests, repeated use, and the wear that breaks PLA or resin parts. That’s why it’s chosen for end-use components, not just prototypes.
Complex geometry. SLS can handle internal channels, undercuts, and organic shapes that would be fragile or expensive to produce with FDM or SLA.
Material efficiency. Unfused powder can be recycled and reused, cutting waste and cost for repeated jobs.
SLS vs FDM vs SLA
Choosing between processes depends on what your part needs to do. FDM is fast and cheap for concept models and prototypes. SLA excels at smooth surfaces and fine detail. SLS balances speed, durability, and design freedom. For parts that need to actually work—jigs, brackets, low-volume production runs—SLS often wins on total cost and reliability.
Common Uses for SLS
End-use production parts in volumes too small for injection molding. Functional prototypes that survive repeated testing. Custom tooling, jigs, and fixtures. Replacement parts for obsolete equipment. Parts that need lightweight strength—especially with composite-reinforced materials.
Material Choices
Nylon is the standard, offering excellent balance of strength, flexibility, and cost. Reinforced nylon—filled with glass or carbon fiber—boosts stiffness for structural applications. Specialty powders including elastomers are available for parts that need to flex.
When to Choose SLS
Choose SLS if your part is too complex or durable for FDM, or if you need smoother finish than standard FDM but don’t need the precision and cost of SLA. If you’re ordering repeated parts in small quantities, SLS pricing-per-unit stays reasonable while maintaining quality.
Cost and Lead Time
SLS costs more per unit than FDM but less than SLA. Lead times are typically 3–5 business days for most parts. Because there’s no post-processing like support removal, turnaround is predictable.
Ready to print with SLS? Send us a file and we’ll quote it fast. Or read how to choose between FDM, SLA, and SLS for your part.
