This thesis presents a clear and well-structured investigation into how Selective Laser Sintering (SLS) printing parameters influence the mechanical behaviour of TPU materials. The author provides a thorough literature background, followed by a carefully designed experimental methodology using Box–Behnken design and ISO-standardized compression testing. The analysis is detailed and methodologically sound, with effective use of MATLAB for data processing and interpolation. The results demonstrate clear parameter–property relationships and offer practical insights for optimizing TPU printing on desktop SLS systems. Overall, the thesis contributes valuable knowledge to the field of additive manufacturing, particularly regarding flexible polymer materials.