Polypropylene‐Based 3D Printed Skin‐Core Structures With Thermal Conductivity and Balanced Mechanical Properties

In this work, polypropylene (PP)-based filaments for Fused Filament Fabrication (FFF) containing boron nitride (BN) or talc (T) were developed and used to formulate multi-functional 3D-printed parts with enhanced thermal conductivity and mechanical properties.More specifically, skin-core structures,with BNin surface layers and talc in the core,were optimized and characterized. Results show that confining BN to surface layers improves in-plane thermal conductivity due to filler alignment during printing. Furthermore, the obtained structures maintain mechanical properties comparable to PP/T mono-material samples, despite reduced filler content and the presence of multi-material interfaces, demonstrating the potential of the proposed strategy for creating high-performance multi-material parts through FFF.