The current contribution elaborates the role of the manufacturing process on the effective mechanical properties of advanced architected materials. For the analysis, gyroid AlSi10Mg alloy based metamaterial specimens are manufactured through hybrid investment casting and power bed fusion (PBF). The effective properties of the as-built metamaterials are experimentally characterized, assessing their elastic and post-elastic material performance. In particular, the elastic stiffness, peak and plateau stress, as well as the overall nonlinear energy absorption of the hybrid-casted and PBF-manufactured specimens are assessed. Micro-tomography and scanning electron microscopy are employed to assess the microstructure and composition differences in each case. By that means, micro-scale observations are related to macroscale mechanical performance attributes. PBF-manufactured specimens are observed to yield a higher elastic stiffness than hybrid casted ones. However, in their post-elastic response, a highly variable stress-strain performance is obtained, contrary to a smooth plateau region for the hybrid casted metamaterial specimens, yielding overall nearly equal energy absorption attributes. The study concludes by assessing the differences arising in the above reported mechanical parameters by the addition of a heat-treatment (T6) post-processing step in the manufacturing stages.