SLS 3D Printing Powder Materials: Selection Guide for Engineers

Powder-based 3D printing technologies, particularly SLS and SLM, use fine powdered materials to create fully functional parts without the need for support structures. The powder bed serves as self-supporting media, enabling geometries impossible with other additive methods. Polymer powders dominate the SLS market, with Nylon 12 being the industry standard. PA12 offers excellent mechanical strength, chemical resistance, and thermal stability. Parts printed in PA12 achieve tensile strength comparable to injection-molded nylon. Nylon 11 provides superior impact resistance for snap-fit designs and living hinges. Metal powders for SLM and DMLS include titanium alloys, stainless steel, aluminum alloys, and Inconel superalloys. Titanium Ti6Al4V is used in aerospace and medical implants due to exceptional strength-to-weight ratio and biocompatibility. Stainless steel 316L serves corrosion-resistant industrial components. Ceramic and sand powders serve specialized applications. Alumina and zirconia ceramics enable heat-resistant furnace components. Foundry sand powders allow direct printing of sand molds for metal casting, reducing pattern-making lead times from weeks to days. Powder characteristics critically affect print quality. Particle size distribution, typically 15 to 80 micrometers, influences packing density and surface finish. Spherical particles flow more consistently than irregular shapes. Moisture content must be carefully controlled as absorbed water causes defects during sintering.