The growing demand for high-performance components has driven interest in polymer–ceramic composites processed via Selective Laser Sintering (SLS). This thesis focuses on the formulation, processing, and characterization of PA12–alumina (Al₂O₃) composite powders for SLS, aiming to increase ceramic content while retaining acceptable printability. Various preparation routes were explored, including mechanical and chemical approaches. Mechanical mixing was performed using Turbula and high-shear blender mixers, while the Thermally Induced Phase Separation (TIPS) method was also tested as a chemical approach. However, the TIPS method proved to be significantly more complex and time-consuming compared to mechanical mixing. It required high-temperature operation, large volumes of solvent, and prolonged processing times, resulting in high energy and material consumption.