Fig. 1.

(A) 3D-printed parts tend to display weak tensile properties in the y and z directions due to poor interlayer welding. To address this, we coated thermoplastic filament with a CNT-rich layer; the resulting 3D-printed part contains RF-sensitive nanofillers localized at the interface. (B) When a microwave field is applied, the interface is locally heated to allow for polymer diffusion and increased fracture strength.