While DMLS (Direct Metal Laser Sintering) and SLM (Selective Laser Melting) are often used interchangeably in conversation, they are not identical in practice. These two metal 3D printing technologies are based on similar principles—layer-by-layer fabrication using a laser and powdered metal but differ significantly in how the material is processed.
DMLS works by sintering the metal powder just below its melting point, bonding the particles together using heat and pressure. This method is ideal for alloys that don’t fully melt or that are designed to maintain some elasticity or thermal properties. It offers excellent dimensional control and works well with materials like titanium or aluminum alloys, but the result can include slight porosity unless post-processing is applied.
In contrast, SLM goes a step further by fully melting the powder to form a single, homogenous structure. The result is a denser, more robust part with superior mechanical properties. This makes SLM more suitable for load-bearing applications or structural components, particularly in aerospace or automotive industries where material integrity is critical.
Understanding these differences is essential for choosing the correct process. Whether you’re aiming for maximum strength, precision, or thermal resistance, aligning your application with the right technology can significantly impact your product’s performance and production efficiency.