This book highlights the novel development of additively manufactured polyurethane (PU)/halloysite nanotube (HNT) nanocomposites with the optimisation of 3D printing parameters in fused deposition modelling (FDM) and nanofiller contents to influence dimensional accuracy, surface roughness, mechanical and thermal properties, as well as shape memory behaviour for potential widespread applications in biomedical engineering, electronics, antistatic materials, thermal insulation, sports equipment, garments, etc.