This study presents a design strategy for manufacturing high-strength and high-conductivity copper (Cu) components using laser powder bed fusion (L-PBF). By uniformly dispersing a small amount of lanthanum hexaboride (LaB₆) nanoparticles in pure Cu, the researchers achieved enhanced mechanical properties, thermal stability, and electrical conductivity. The LaB₆ nanoparticles dissolve in the melt pool during laser melting and re-precipitate uniformly during solidification, providing effective strengthening without significantly affecting the conductivity. The resulting Cu alloy, 1.0LaB₆-Cu, exhibits a yield strength of 347 ± 2 MPa, an elongation to failure of 22.8 ± 1.2%, and an electrical conductivity of 98.4% IACS, with a thermal conductivity of 387 W m⁻¹ K⁻¹. It also maintains its strength at high temperatures (up to 1050°C), making it suitable for demanding applications. The strategy enables the fabrication of geometrically complex components with high performance, expanding the applicability of 3D-printed Cu in areas requiring both mechanical and thermal stability. The study also demonstrates the effectiveness of this approach in producing Cu parts with high density and mechanical properties, overcoming the limitations of pure Cu in additive manufacturing. The results show that the addition of LaB₆ nanoparticles enhances the strength and ductility of Cu while maintaining high conductivity, offering a promising solution for advanced Cu components in various engineering applications.This study presents a design strategy for manufacturing high-strength and high-conductivity copper (Cu) components using laser powder bed fusion (L-PBF). By uniformly dispersing a small amount of lanthanum hexaboride (LaB₆) nanoparticles in pure Cu, the researchers achieved enhanced mechanical properties, thermal stability, and electrical conductivity. The LaB₆ nanoparticles dissolve in the melt pool during laser melting and re-precipitate uniformly during solidification, providing effective strengthening without significantly affecting the conductivity. The resulting Cu alloy, 1.0LaB₆-Cu, exhibits a yield strength of 347 ± 2 MPa, an elongation to failure of 22.8 ± 1.2%, and an electrical conductivity of 98.4% IACS, with a thermal conductivity of 387 W m⁻¹ K⁻¹. It also maintains its strength at high temperatures (up to 1050°C), making it suitable for demanding applications. The strategy enables the fabrication of geometrically complex components with high performance, expanding the applicability of 3D-printed Cu in areas requiring both mechanical and thermal stability. The study also demonstrates the effectiveness of this approach in producing Cu parts with high density and mechanical properties, overcoming the limitations of pure Cu in additive manufacturing. The results show that the addition of LaB₆ nanoparticles enhances the strength and ductility of Cu while maintaining high conductivity, offering a promising solution for advanced Cu components in various engineering applications.