Se­lec­tive Laser Sin­ter­ing

In­ter­est­ing facts about 3D print­ing tech­nol­o­gy

The rel­e­vance of Se­lec­tive Laser Sin­ter­ing lies in its abil­i­ty to pro­duce cus­tomized pro­to­types and com­po­nents with in­tri­cate de­tails and high strength. This tech­nol­o­gy is par­tic­u­lar­ly ap­peal­ing to in­dus­tries that need to re­spond quick­ly and ef­fi­cient­ly to mar­ket de­mands, such as the au­to­mo­tive, med­ical tech­nol­o­gy, and aero­space sec­tors.

By com­bin­ing ver­sa­til­i­ty and a wide range of ma­te­ri­als, SLS en­ables both the de­vel­op­ment of new prod­ucts and the op­ti­miza­tion of ex­ist­ing de­signs—all with an ef­fi­cien­cy that tra­di­tion­al man­u­fac­tur­ing meth­ods can­not match.

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34 years of experience

Resilient prototypes for your projects

Efficiency

Combination of versatility and material diversity

For every industry

From automotive to dentistry

Well advised

Reach your goal quickly with our experts

Maximum data protection

Your data is in safe hands with us

34 years of experience

Resilient prototypes for your projects

Efficiency

Combination of versatility and material diversity

For every industry

From automotive to dentistry

Well advised

Reach your goal quickly with our experts

From Powder to Component

An in­tro­duc­tion to the man­u­fac­tur­ing process

Thanks to the combination of versatility and material diversity, SLS enables both the development of new products and the optimization of existing designs - and all this with an efficiency that traditional production methods cannot offer.

The course of the procedure

1. Powder Coating

First, a thin layer of the desired material—often polyamide (nylon), but also TPU or various metals—is evenly applied to the build platform. The material is spread precisely using a recoater blade.

Powder layer in the SLS system.

2. Laser Sintering

A high-precision laser beam heats the defined areas of the powder layer to the sintering temperature. In these areas, the particles fuse into a solid structure without fully melting. The laser is computer-controlled, accurately reproducing the geometry of the component based on CAD data.

Precise monitoring of all processes.

3. Layered structure

Printed, robust and strong standard materials.

After the first layer is sintered, the build platform lowers slightly, and a new layer of powder is applied. This process is repeated until the entire component is built. The layer thickness typically ranges between 0.05 and 0.15 mm, enabling precise representation of even fine details.

Melting the SLS powder

4. Cooling and post-processing

After the build process is complete, the component must cool within the powder bed to prevent stress and deformation. The excess powder surrounding the component can then be removed and is often reusable. If necessary, post-processing follows to clean the component and, if needed, smooth or color its surfaces.

Cleaning the SLS component after removal from the powder bed.

Ma­te­ri­als for se­lec­tive laser sin­ter­ing

Typical SLS Plastic Materials and Their Properties

Polyamide (Nylon)

Nylon is one of the most commonly used materials in the SLS process. It is a thermoplastic with balanced mechanical properties and a fine surface resolution. It stands out for its high strength, good chemical resistance, and flexibility. The material is also highly resistant to stress cracking, even in the presence of chemicals, and effectively dampens noise and vibrations. Nylon parts are suitable for both functional prototypes (functional testing) and end products (low to medium production volumes), as they are durable and mechanically robust.

TPU (Thermoplastic Polyurethane)

TPU is flexible, elastic, and abrasion-resistant, making it particularly suitable for applications where the part requires a certain degree of stretchability or impact absorption. This is especially relevant in the medical and automotive industries.

Reinforced Plastics

SLS can also work with glass- or carbon-fiber-reinforced plastics to produce parts with even higher strength and stiffness. These materials are frequently used in the automotive and aerospace industries, where durability and weight are critical factors.

Selective Laser Sintering in Practice

Ar­eas of ap­pli­ca­tion and in­dus­try so­lu­tions

Selective Laser Sintering (SLS) has established itself across a wide range of industries due to its flexibility and precision. Whether in the development of functional prototypes, the production of small series, or the manufacturing of specialized end products, the SLS process enables tailored solutions precisely aligned with the requirements of the respective industries.

SLS-Pro­to­types

SLS in prototyping enables fast results with high precision. As the process reliably produces complex geometries and intricate structures, designers and engineers can create detailed and functional prototypes suitable for testing and validation.

Med­ical Tech­nol­o­gy

SLS applied in medical technology enables the production of biocompatible and sterilizable components that can be specifically tailored to a patient’s anatomy. This is particularly advantageous for orthopedic devices, dental implants, and medical instruments.

Au­to­mo­tive In­dus­try

SLS enables the production of functional components that can be used for testing under real-world conditions. From interior parts to panels, the ability to manufacture lightweight yet durable plastic components makes SLS an indispensable tool for the development and validation of new vehicle components.

Aero­space

The aerospace industry benefits significantly from SLS's ability to produce highly precise and lightweight components. The technology enables the production of geometrically complex structures that are not only capable of withstanding high stresses but are also optimized for weight and functionality.

Ad­van­tages of se­lec­tive laser sin­ter­ing

Selective laser sintering (SLS) is one of the most popular additive manufacturing technologies because it offers companies an impressive range of possibilities. Compared to traditional methods and other 3D printing techniques, SLS provides unique advantages in terms of design freedom, material properties, and manufacturing efficiency.

Our case studies

MOD­­EL­L­TECH­NIK IN AC­­TION

Automotive

A body with class: We produced the master model for the body of the cult Evetta light electric vehicle on a 1:1 scale – with perfect milling and the finest surface finishing. Find out how.

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Industry

The socket for the forest: We developed the prototypes for a type of powerbank for Stihl, which was put through its paces by forestry workers. A truly powerful project.

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Aerospace

"Jena, we have no problem": Jena-Optronik commissioned MODELLTECHNIK to produce a 1:1 model of the Gateway Docking Port, which is needed for sensor tests in space applications.

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Design

Timeless and dignified: Working with Samosa and our expertise in 3D printing, MODELLTECHNIK creates beautiful templates and design samples for individually designed funeral urns.

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