The current research aims to evaluate the feasibility of producing an aluminum-based composite whose Cu reinforcement phase is prepared by investment casting. The key characteristic of the Cu reinforcement is its unity and integration. The resin model of the integrated reinforcing phase has been prepared by the 3D printing method with a repeating geometry of ordered cubic cells with strut diameters of 2 and 3 mm. Hence, after placing the resin model in the plaster mold and draining the resin, and then baking the mold, by pouring molten copper into it, an integrated 3D Cu lattice structure is obtained. In the following, by placing this ordered Cu lattice structure in a rectangular cube metal mold, the penetration casting operation is performed by molten Al in the space of this Cu lattice, inside an electric furnace. Finally, by controlling the soaking time in the furnace, the solidification speed will be determined before the Cu lattice structure dissolves in the aluminum matrix, and a new metal/metal composite will be cast. Then, the compressive properties of the produced Al/Cu composites reinforced with Cu lattice structure with 2 and 3mm strut diameters were measured, and their phase structure was analyzed to investigate their compressive behavior. The results showed that the toughness of the composites reinforced with 2 and 3-mm lattice structures is about 114 and 168 MJ.mm^-3, respectively, which is about 3.5 times higher than the toughness of their copper lattice structures.