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Selective Laser Sintering (SLS)

Selective laser sintering (SLS) is a powerful 3D printing technology that produces highly precise and durable components capable of being utilized straight in end-use, low-volume manufacturing, or rapid prototyping. SLS can construct components wholesale without support structure needs. SLS products are largely nylon and An additive manufacturing layer technology, selective laser sintering includes making use of a high-power laser (for instance, a carbon dioxide laser) to fuse little particles of plastic powders right into a mass that has a desired three-dimensional shape. The laser selectively fuses powdered material by scanning cross-sections generated from a 3-D digital description of the part (for example from a CAD file or check information) on the surface of a powder bed. After each cross-section is checked, the powder bed is decreased by one layer thickness, a brand-new layer of material is applied on top, and also the selective laser sintering procedure is repeated till the part is finished.

Why Use SLS?

See how SLS uses actual thermoplastic and elastomeric materials to produce parts with good mechanical properties. Final parts can be used to test future injection molding designs or as functional, end-use components.

Design Guidelines for Selective Laser Sintering (SLS)

Our basic guidelines for selective laser sintering include important design considerations to help improve part manufacturability, enhance cosmetic appearance, and reduce overall production time.

SLS Tolerances

For well-designed parts, tolerances of ±0.010 in. (0.25mm) for each additional inch can typically be achieved. Note that tolerances may change depending on part geometry.

SLS Part Warpage

Larger part sizes (>7 in.) and parts with thin features are the most susceptible to warp. We recommend maintaining a uniform thickness of 0.125 in. (3.175mm) to ensure stability.​

US Metric
All SLS Materials 10.6 in. x 12.6 in. x 16 in. 269mm x 304mm x 406mm
PA12 19 in. x 19 in. x 17 in. 482mm x 482mm x 431mm
US Metric
Minimum Wall Thickness  0.030 in. 0.762mm

Selective Laser Sintering (SLS) Materials

PA 11 Black (PA 850) provides ductility and flexibility without sacrificing tensile strength and temperature resistance. These characteristics make PA 850 a widely used general-purpose material for functional and moving parts.

Primary Benefits​

  • Highest elongation at break of all additively manufactured nylons
  • Uniform deep-black color that showcases features and provides a clean appearance

PA 12 White (PA 650) is a go-to material for general-purpose applications like functional and end-use parts. PA 650 is the strongest of the unfilled nylon materials and it is slightly stiffer than PA 11 Black.

Primary Benefits​

  • Economical material choice
  • Strength and stiffness

PA12 Mineral-Filled (PA620-MF) is a 25% mineral fiber-filled PA powder. The fiber content significantly increases stiffness and HDT (up to 363 °F). It is a good material option when stiffness and high temperature resistance are important requirements.

Primary Benefits​

  • Highest stiffness of all additively manufactured nylons
  • Temperature resistance

PA12 40% Glass-Filled (PA614-GS) is a PA powder loaded with glass spheres that make it stiff and dimensionally stable. This material is an ideal candidate for parts that require long term wear resistance properties. Due to the glass additive, it has decreased impact and tensile strengths compared to other nylons.

Primary Benefits​

  • Long-term wear resistance
  • Increased stiffness

Polypropylene Natural offers chemical resistance properties that are top among the SLS and MJF material offerings. This tough and durable, yet flexible, material offers resistance to most acids and is a low weight material option.

Primary Benefits​

  • Chemical resistance
  • Durable, low weight material

TPU 70-A is a white thermoplastic polyurethane that combines rubber-like elasticity and elongation with good abrasion and impact resistance properties. The rubber-like quality of this material make it ideal for seals, gaskets, grips, hoses, or any other application where excellent resistance under dynamic loading is required.

Primary Benefits​

  • High elongation at break
  • Flexibility

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