Formlabs Fuse Sift SLS Powder Recovery Station

The main advantage of SLS 3D printers is their ability to rapidly fabricate ultra-strong, functional parts with complex geometries without using any support structures.

Comparing SLS with traditional technologies for manufacturing and prototyping:

• FDM printing uses plastic filament and strictly requires supports. Parts exhibit pronounced anisotropy (meaning they break easily along the layer lines).
• SLA printing works with liquid resin, providing high accuracy but requiring supports that leave marks upon removal. Parts can be fragile unless specialized engineering photopolymers are used.
• SLS printing: A high-precision laser sinters powder. Parts possess isotropic strength (equally strong in all directions) and a smooth matte surface finish, with no support structures needed at all, as the surrounding unsintered powder supports the part during printing.

Selective Laser Sintering (SLS) technology involves layer-by-layer melting and bonding of polymer powder micro-particles using a high-power laser beam.

Before each new layer is formed, a specialized roller or blade (recoater) applies a thin, even coat of powder across the build platform. The laser then sinters the material particles along the model's predefined contour. This process repeats layer-by-layer until the part is fully formed inside the build chamber.

The primary materials used in SLS technology are powders based on engineering polyamides (nylon), flexible elastomers, pure polypropylene, and reinforced composites.

Our catalog offers original SLS powders, which are divided into several key categories:

• Nylon (Nylon 12 and Nylon 11): Core engineering thermoplastics. Nylon 12 delivers high stiffness and dimensional accuracy, while Nylon 11 provides enhanced elasticity, which is optimal for prosthetics, living hinges, and thin-walled parts.
• Composite Nylons (Glass-Filled and Carbon-Filled): Reinforced materials designed for extreme mechanical stress. Glass-filled Nylon 12 GF guarantees maximum thermal resistance and stiffness, whereas carbon-filled Nylon 11 CF provides exceptional tensile strength at an incredibly low part weight.
• Formlabs Polypropylene (PP): An authentic powder-based polypropylene used to fabricate ultra-lightweight, ductile, watertight parts with superior chemical resistance to acids, fuels, and solvents.
• TPU (Thermoplastic Polyurethane): An elastic, rubber-like powder for printing shock absorbers, shoe outsoles, flexible ducting, and soft seals.

SLS printers do not require supports because the unsintered powder inside the build chamber acts as a natural scaffolding for the part at every stage of the process.

This grants absolute freedom to designers, allowing the creation of components of any complexity—including internal channels, cavities, or pre-assembled moving joints—without worrying about support removal. Once printing is complete, the part is simply extracted from the powder block, and the excess powder is cleaned in a sifting station to be recycled for future print cycles.

SLS technology is ideally suited for rapid fabrication of fully functional prototypes, end-use small-batch production, and custom prosthetics.

Due to the isotropic strength of the material, printed parts can be used under direct mechanical loads. This technology is most frequently chosen for the following applications:

• Professional SLS 3D printing for automotive, aerospace, and defense industries.
• Creating electronic enclosures, custom medical devices, and orthotic braces.
• Launching small-scale production of plastic parts without the need for expensive injection molding metal tooling.
• The benchmark in this segment is the Formlabs Fuse series, bringing industrial-grade nylon printing to local workshops and engineering bureaus.