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Selective Laser Sintering (SLS)

Laser sintering

Sample parts and prototypes, which are verifiable in their geometrical form as well as in their functionality and show mechanical property, are manufactured using laser sintering. In the process a polyamide powder is fused in layers by a laser. The real model achieves a high dimensional and contouring accuracy with a general deviation of +/- 0,5%. For small components with a size of less than 30 mm, there is a general deviation of +/- 0.15mm.

A very good surface condition can be achieved by reworking and varnishing the polyamide models. The laser sintering process is most suitable for the production of functional prototypes with snap-fits, integral hinge and clip connections for functional models, installation trials, design review and rapid manufacturing with lot sizes up to 250 pieces.

Laser sintering allows fast production of prototypes for far-reaching functional examinations. The mechanical and thermal properties comparatively enable the parts to endure extreme stress. The processing time is 3 to 5 work days.

Product sheet SLS  [1,1 MB]
SLS Systems
  EOS GmbH - EOS P 770
  Build size (X x Y x Z) 700 x 380 x 580 mm
  Number of systems: 2
  EOS GmbH - EOS P 760
  Build size (X x Y x Z) 700 x 380 x 580 mm
  Number of systems: 1
  EOS GmbH - EOS P 396
  Build size (X x Y x Z) 340 x 340 x 600 mm
  Number of systems: 3
  EOS GmbH - EOS P 395
  Build size (X x Y x Z) 340 x 340 x 600 mm
  Number of systems: 1
  EOS GmbH - Formiga P 100
  Build size (X x Y x Z) 200 x 250 x 330 mm
  Number of systems: 1
Procedural principle

The process uses a polyamide powder which is subjected to localised melting in layers using a laser beam.

Laser sintering
Material data
Laser sintering

  Standard materials such as fine polyamide comparable to PA 12 are being used in the EOSINT machines. They are
  available without glass filling as PA2200 or with glass filling as PA 3200GF. The polyamide PA 2200 is certificated as

  Alumide is a metallic grey, aluminium-filled nylon 12 powder with excellent
  dimensional accuracy. . It is suitable for the production of highly robust, rigid,
  high-precision pieces. The material is suitable for a range of applications.
  The components are particularly suitable for applications in automotive
  manufacturing (e.g. wind tunnel tests), as well as for the construction of
  gauges and equipment.
  Click here for the technical data sheet on Alumide [36 KB]
  Material sheet Alumide [799 KB]

  PA2200 is a fine white powder based on nylon 12. It is suitable for the production
  of highly robust, strong, high-precision, high-performance pieces. The material is
  biocompatible and certified for contact with food. The material is particularly
  suitable for models and assemblies with high demands with respect to
  mechanics and fracture behaviour. Typical applications for this material include
  moving connectors, high-performance pieces, prostheses and orthoses. The
  components work particularly well as medical models and products.
  Click here for the technical data sheet on PA2200 [36 KB]
  Material sheet PA2200 [699 KB]

  PA 2201 is a white, slightly translucent nylon 12 powder. It is suitable for the
  production of highly robust, strong, high-precision, high-performance pieces.
  The material meets the FDA’s strict requirements, and is suitable for a wide
  range of applications in the fields of medicine and healthcare. The components
  work particularly well as medical models and products.
  Click here for the technical data sheet on PA2201 [36 KB]
  Material sheet PA2201 [671 KB]

  PA 3200 GF is a white, glass bead-filled nylon 12 powder that combines rigidity
  with good elongation at rupture. It is suitable for the production of highly robust,
  rigid, high-precision pieces. The material stands out on account of its good
  dimensional stability under heat, and is particularly suitable for pieces
  subjected to thermal stress. The components work particularly well as end
  products in the engine areas of vehicles.
  Click here for the technical data sheet on PA 3200GF [36 KB]
  Material sheet PA 3200GF [676 KB]

  TPU 1301
  TPU 1301 is a white, thermoplastic polyurethane powder with rubber-like
  elasticity. It is suitable for the production of highly flexible, abrasion-resistant,
  high-precision pieces. The material is particularly suitable for bending parts.
  Typical fields of application include shoe soles, damping elements, orthopaedic
  inserts, seals, pipes, grips, bellows and tyres.
  Click here for the technical data sheet on TPU 1301 [32 KB]
  Material sheet TPU 1301 [729 KB]

Mechanical characteristics
Under no circumstances can the published information about the material data be considered as express warranty or otherwise. The density and mechanical properties may vary depending on the light exposure parameters and the x, y, z positioning of the test pieces. The application of these information and references as well as the decision on the suitability of any product for special applications is in all cases subject to the sole responsibility of the user.
Surface technology and assembly

Our trained model makers support you with different surface finishes and assembly work in order to ensure that your prototype is as close as possible to the future series-produced piece. We define the level of detail in consultation with you.

Selektives Lasersintern Einfärben
  Polishing/top finish
  We can polish components to smoothness, gloss or high-gloss. SLA parts made from
  WaterShed® XC 11122 or Accura® ClearVue can be given a top finish in order to make
  them transparent.

  Chemical smoothing
  Chemical smoothing seals the surface, and pieces are smoothened, sealed and made
  resistant to dirt. The mechanical properties are also improved, since smoothing the edges
  of the layers reduces the notching effect. Dyed pieces last even longer following treatment.
  The properties of biocompatible materials, for example in the food industry or medical   products,are preserved.

  Infiltration involves dipping pieces in transparent epoxy resin. Epoxy infiltration provides air
  and water-tight sealing that can withstand high temperatures or chemicals. No material is
  deposited as part of the infiltration process, which means that it does not interfere with



  cirp now offers a wide range of colours. The components are fully coloured up to a depth
  of around 0.3 mm. The colours are resistant to UV rays, water and abrasion. No material is
  deposited as it would be in the case of painting or metal coating.

             Our cirp color palette

Farbmuster SLS cirp 01 black
    cirp 01 black

Farbmuster SLS cirp 02 dark gray
    cirp 02 dark gray

Farbmuster SLS cirp 03 light gray
    cirp 03 light gray

Farbmuster SLS cirp 04 violet
    cirp 04 violet

Farbmuster SLS cirp 05 blue
    cirp 05 blue

Farbmuster SLS cirp 06 light blue
    cirp 06 light blue

Farbmuster SLS cirp 07 magenta
    cirp 07 magenta

Farbmuster SLS cirp 08 red
    cirp 08 red

Farbmuster SLS cirp 09 orange
    cirp 09 orange

Farbmuster SLS cirp 10 yellow
    cirp 10 yellow

Farbmuster SLS cirp 11 light green
    cirp 11 light green

Farbmuster SLS cirp 12 green
    cirp 12 green

Farbmuster SLS cirp 13 dark green
    cirp 13 dark green

  The SLA parts can be painted in any RAL colour. Special paint applications are also

  Metal coating
  Galvanic coating or aluminisation are used to achieve results that range from chrome-like
  to high-gloss. The substrate also ensures outstanding thermal and electrical conducting

  Fitting of threaded

  Various threaded inserts may be fitted into the laser-sintered piece should you wish.

  If necessary, the cirp team will also help you put together your component assemblies.
  This also includes the assembly of individual electronic components and purchased parts.

Current construction jobs

3D-printed base stand

purmundus is a design brand registered by cirp, and offers an innovative portfolio of 3D-printed table and standard lamps. As a technical centrepiece, the base stand is integrated into the socket of the designer lamp, and in addition to affixing the carbon-fibre rod and mounting the plates, serves as a pressure mechanism for the on/off switch.

Project: Mechanical series production component for a designer lamp

Material: PA2200

Product link  (purmundus.en)

Customers of cirp GmbH receive a 25% discount!


Copyright purmundus

Additive manufactured expansion head

The additive manufactured expansion head will be used to spread contact lens blisters. The transfer process is carried out by a Delta-Robot. The SLS material PA2200 allows us to manufacture thin-walled structures that are flexible enough to compensate for the movement of the expansion head.

Project: Custom job

Material: PA2200

Further informations about Harro Höfliger Verpackungsmaschinen GmbH   (


Copyright Harro Höfliger Verpackungsmaschinen GmbH / Nico Hjordt

Ballet slipper with soft shoe sole

For professional use, a pair of flats rarely lasts longer than one day. Sophia Lindner, as a product designer, has developed a patentable solution of a lasting design together with experts on the field of sports medicine, ballet dancers and shoemakers.

Project: functional prototype of a soft shoe sole

Material: TPU 1301

Product link  (

cirp GmbH TPU Ballettschuh

Copyright Sophia Lindner / cirp GmbH

Kinetic sls bistable lampshade

The kinetic sls standard lamp invites interaction. Its perforated core is entwined by a second, shifting level of translucent leaves that take up the special light structure. Simply pulling on two opposing leaf points opens the shade, and makes way for the light to create a futuristic shadow play. In this way, the kinetic sls combines multifaceted nuances of lighting with an innovative technical principle. The LED lamp is compatible with all sls series lampshades.

Design: Frank Kleemann

Material: PA2200

Product link  (


Copyright purmundus