SELECTIVE LASER SINTERING (SLS)

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Selective Laser Sintering

About SLS 3D Printing

Selective Laser Sintering uses high-powered lasers to sinter powdered material creating a solid structure. Parts are supported by unsintered powder in each layer. Once printing is complete, the part is removed from the remaining powder and cleaned by hand and by using water/air jets.

Parts created using this technology present a good strength to weight ratio and are usually white in color. Most of the SLS parts are made of polymers. High level of accuracy, cheap feedstock and high temperatures achievable with SLS printing make it an incredibly useful technology with a broad range of applications ranging from architectural models to control surfaces of aircraft and surgical tools.

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Overview

In SLS, a laser selectively sinters the particles of a polymer powder, fusing them together and building a part layer-by-layer. The materials used in SLS are thermoplastic polymers that come in a granular form.

 

During the 3D printing process, the SLS machine preheats the bulk powder material in the powder bed somewhat below its melting point, to make it easier for the laser to raise the temperature of the selected regions the rest of the way to the melting point. A roller will apply a layer of polymer powder, then the laser will sinter the powder according to the 3D file and the build platform will lower before applying a new layer of powder. The process will be repeated until the desired part is created. 

 

SLS does not require support structures because unsintered powder surrounds the parts during printing. SLS printing can produce previously impossible complex geometries, such as interlocking or moving parts, parts with interior components or channels, and other highly complex designs.

Applications

materials

Nylon PA12 White (PA2200)

TENSILE STRENGTH (MPA)DENSITYHDTMELTING TEMPERATURE °C
50930 kg/m395176 °C

Nylon PA12 Grey MJF

TENSILE STRENGTH (MPA)DENSITYHDTMELTING TEMPERATURE °C
481075 kg/m395175

Nylon PA12 Glass Filled (PA3200)

TENSILE STRENGTH (MPA)DENSITYHDTMELTING TEMPERATURE °C
5165.02 kg/m3176175

Design Rules

Minimum Wall thickness: 0.8 mm – 1.0 mm

Minimum details size: 2.5 mm (for text/ hole diameters etc)

Layer thickness: 0.08 mm – 0.1 mm

Max dimensions: 380 x 284 x 380 mm. Large parts can be created with assembling individual parts by interlocking designs or glueing together. 

Standard Accuracy: ± 0.3% (with lower limit on ± 0.3 mm).

Lead Time: Minimum 2-3 working days for dispatch

Surface finish: Grainy matt finish

post processing

Basic: Powder removal, Bead blasting. 

Add on: Primer, Coating/ Painting

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Frequently Asked Questions

SLS is suitable for any stage of product development, from a functional prototype, to a single-use part, or to create operational pieces.
Yes we can do tapping after printing. We can also fix brass inserts if required.
Parts printed with Nylon PA12 material are biocompatible.
Parts strength wise both has similar properties. MJF parts has slight advantage on surface finish

Yes, we can do CNC machining on SLS parts.

Yes. But we need to give escape holes to remove unsintered powder.
SLS printed parts are 3 times costlier than FDM. Extra cost gives more complex & quality parts.

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