Selective Laser Sintering(SLS)

Print your SLS parts with fast turnaround and wide variety of Nylon materials as fast as 2-3 days!

Overview: How SLS 3D Printing Works?

The Basics of SLS 3D Printing

Selective laser sintering (SLS) is an additive manufacturing technique that uses a laser as the power source to sinter powdered material (typically nylon or polyamide), aiming the laser automatically at points in space defined by a 3D model, binding the material together to create a solid structure. It is similar to selective laser melting; the two are instantiations of the same concept but differ in technical details.

3D printing basics

Benefits of SLS 3D Printing

3D printing benefits
  • SLS 3D Printing Service uses production-grade nylon materials, resulting in durable, functional parts that last.

  • SLS printed parts rival other parts produced using traditional manufacturing methods.

  • The robustness of SLS makes this technology great for:Complex and durable production parts; Production and prototype parts that need to withstand high-heat environments or chemical exposure Impact-resistant parts.

Benefits of SLS 3D Printing With Unionfab

  • Unionfab has imported EOS equipment, as well as domestic nylon machines and materials with high cost performance to meet the needs of different customers.

  • Unionfab can provide customers with eight SLS 3D Printing materials, including SLS Nylon 11 (Black), SLS Nylon 11 (White), SLS Nylon 12 (White), SLS Nylon 12 (Black), Nylon 12 Glass-Filled (Black), Nylon 12 Glass-Filled (Offwhite), PA6GF and SLS TPU. At the same time, we jointly develop unique materials for aerospace, medical and other applications with partners to help our customers expand the application scope and depth of additive manufacturing.

  • Unionfab has a professional team of engineers and production capacity to provide more diversified, efficient and cost-effective SLS 3D printing solutions for different application scenarios of industrial customers.

Features of SLS 3D Printing



Nylon is a durable material with great impact strength, medium flexibility, and high resistance to environmental factors.

Rapid Turnaround

Parts can typically be shipped in 3-4 days, allowing for faster design iterations and speed to market.

Parts Production

SLS is capable of producing end-use parts on-demand, increasing throughput.

Complex Geometry

Geometries can be built more easily due to the 3D printing process, adding complexity without additional cost.


SLS can make a single part or component as easily as dozens of production pieces.


We use the latest generation of SLS technologies to meet tolerances of +/- 0.010” or +/- 0.002” per inch, whichever is greater. Please see our Manufacturing Standards for more details.


Material Limits

You can expect more SLS materials coming soon!

Scale Effect

The unit cost and lead time will not be reduced as much as casted or molded parts.

Design Guidelines: Selective Laser Sintering(SLS)

  • Max Part Size
  • Layer Thickness / Resolution
  • Wall Thickness
  • Tolerances
  • Surface Finish Options
PA12 GB14 in. x 14 in. x 16 in.350mm x 305mm x 400mm
PA1214 in. x 14 in. x 16 in.350mm x 305mm x 400mm

SLS Machines of Unionfab

Production Machines

ProcessNameNumbersProcess Size(mm)Detail
SLSFarsoon-403P18350*350*4103 files
EOS-P7601635*320*5203 files
EOS-P1102185*235*3053 files

Post-Process Machines

ProcessNameNumbersProcess Size(mm)Detail
Sand-blastingSand blasting machine2400*800*5000 files
AnodizedAnodizing equipment2800*2000*5000 files
PolishChemical polishing line2600*1200*4000 files
Magnetic polishing machine260*60*600 files
PaintingPainting Line21000*2000*10000 files
ElectroplatingElectroplating line2600*1800*5000 files

Available Finishes

SLS parts are de-powdered with a sandblasting process and manual powder removal. Internal holes may be drilled to size if accessible. The finish is white matte (fine sugar-cube).
available finish - defaults

SLS 3D Printing Applications

With SLS, the prototype can be made using nylon material with great functionality. Fast turnaround makes it a good choice for functional prototyping.
Customized Products
The speed and versatility of SLS let variable production of customized gifts/samples for different users become possible.
Batched Products
SLS can be applied to make high-quality small batched products from 1-10,000 units, ideal for small businesses that wishes to test the market’s reaction to their newly developed products.

Industries with SLS 3D Printing

Consumer Products
Art and Fashion

Knowledge Base