“…Inspired by the successfulness of 3D printing in developing end-product from polymer nanocomposites, it starts to attract attention to employ it in metal matrix composites. Hu's group reported promising results of 3D printed metal-matrix nanocomposites [27][28][29][30]. In a recent study, Hu et al [28] prepared Al/graphene platelets nanocomposites using 3D printing technology.…”