Laser Sintering (SLS)

    Polyamide laser sintering is an additive manufacturing technology that allows obtaining functional parts with an excellent mechanical behaviour.

    Laser Sintering (SLS)

    It is the most suitable technology for the direct manufacture of functional parts, prototypes and parts in series (Rapid Manufacturing) with mechanical characteristics similar to those of injected thermoplastics.

    Initially, it began to be used for manufacturing rapid prototypes, but increasingly it is used to manufacture parts in series. The ability to produce pieces with a very complex geometry directly from digital CAD models has facilitated their growth and expansion worldwide.

    At Ineo we have experience in the different applications of this additive manufacturing technology, since we have used it since its inception. The sintered laser is one of the reference technologies for the manufacture of parts.

    At Ineo Prototypes we have polyamide laser sintering machines (SLS), with which it is possible to build large format pieces in short delivery time. Likewise, we offer a wide range of services to improve the design and finishing of the pieces.

    What is laser sintering?

    Selective laser sintering (SLS) is a 3D printing process for the manufacture of final parts, models and prototypes, which solidifies layer by layer powder of polyamide by means of a laser.

    How does it work?

    With the 3D geometry, the orientation of the piece that must be manufactured is decided. With the help of a computer software for 3D processing that organizes and translates the information, an STL file is generated with the layers of the piece, depending on the size of the object and the resolution of the sintering machine. STL is the standard file format for additive manufacturing technologies.

    The manufacturing process starts at the machine in an inert chamber and preheated to 170ºC where a layer of powder material is deposited in the work zone. The laser selectively fuses each of the layers in said area and the platform moves downward for each layer sequentially.

    After the manufacture, the pieces are extracted and are passed through a sandblasting process for cleaning, thus being finished.

    Applications of laser sintering (SLS)

    The parts manufactured by laser sintering are very suitable as functional parts and allow the application of different surface finishes. This technology allows high productivity and has applications such as:

    • Functional pieces
    • Manufacture of short series of pieces (low volume manufacturing)
    • Models of dimensional and functional product validation
    • Possibility of sintering sand to make cores or sand molds for foundry
    • Manufacture of complex geometry parts

    Advantages of laser sintering (SLS)

    Some of its advantages are:

    • Materials: PA12m, PA11, PP, PEEK, PE, PA + FV, PA + FC, elastomer, sand, metal
    • Productivity: ability to manufacture many pieces at once quickly
    • Possibility of application of different surface finishes
    • Especially recommended for short series of small or medium pieces
    • Complete freedom of design supports not required, the dust supports the piece
    • Option to nest pieces (one inside the other)

    Aspects to consider

    Some considerations regarding the sintering laser:

    • Possible deformations in very large pieces
    • Slightly rough surface appearance
    • A cooling and cleaning process of the parts is required

    Materials for 3D SLS printing

    We offer various state-of-the-art materials for the manufacture of laser sintered parts. On this page we present the main materials we work with and their most relevant characteristics, if you need a special material do not hesitate to contact us.
    Duraform PA12

    Very good mechanical and thermal behaviour (> 90ºC) and against solvents (hydrocarbons, alkalines). Sterilizable, FDA approved, biocompatible, long durability and aging resistance, can be machined, slightly rough surface.

    Ideal for manufacturing parts with good mechanical properties.

    Density: 1 g / cc
    Flexural module: 1,387 MPa
    Elongation at break: 14%
    Bending temperature under load (ASTM D648 - 1.82MPa / ISO 75): 95 ºC


    Temperature resistance

    Impact Resistance

    Duraform PA12 G

    Polyamide 12 with glass charge. Very good mechanical and thermal behaviour (> 134ºC), against solvents (hydrocarbons, alkalines), long durability and resistance to aging, can be machined, slightly rough surface.

    Ideal for manufacturing parts with good mechanical and thermal properties.

    Density: 1.49 g / cc
    Flexural module: 3,106 MPa
    Elongation at break: 1.4%
    Bending temperature under load (ASTM D648 - 1.82MPa / ISO 75): 134 ° C


    Temperature resistance

    Impact Resistance

    Alumide – PA12

    Polyamide 12 with high rigidity aluminium and high thermal resistance, long durability and aging resistance, can be machined, good heat transmission, aluminium colour.

    Ideal for manufacturing parts with good mechanical properties and high thermal resistance.

    Density: 1.36 g / cc
    Flexural module: 3,600 MPa
    Elongation at break: 4%
    Bending temperature under load (ASTM D648 - 1.82MPa / ISO 75): 144 ° C


    Temperature resistance

    Impact Resistance

    TPU powder

    Rubber thermoplastic polyurethane to make rubber parts with good elastic characteristics.

    Ideal to build rubber parts with uniform surface finishing with soft texture. White colour. High durability.

    Density: 1.10 g / cc
    E-Modulus: 55 MPa
    Elongation at break: 550% (300% at Z)
    Vicat softening temperature ISO306: 60ºC
    Shore A hardness:> 75


    Temperature resistance

    Impact Resistance

    INEO PROTOTIPOS S.L. Design, prototyping and additive manufacturing.
    Avenc del Daví, 6 Pol.Ind.Can Petit Terrassa, 08227 Barcelona Spain
    Tel. +34 937 337 000 Email: