What is the most common cause of contamination in powder recycling for SLS?

The most common cause of contamination in powder recycling for SLS (Selective Laser Sintering) is the introduction of foreign particles from the surrounding environment and equipment. These contaminants can include dust, fibers, debris from cleaning tools, and particles shed from the machine's components themselves. Inadequate filtration during powder sieving and handling further exacerbates the problem. Even small amounts of contamination can negatively affect the sintering process and the mechanical properties of the printed parts. The contaminants can disrupt the powder bed packing, interfere with laser absorption, and act as nucleation points for defects. Therefore, maintaining a clean environment, using appropriate personal protective equipment, and implementing rigorous cleaning procedures for all powder handling equipment are essential for minimizing contamination during powder recycling.