Fig. 2.

Ti–6Al–4V specimens' morphological characteristics of different topological structures fabricated by SLM: (A) Optical photographs show the front view of the 3D printed graded pentamode lattice and SEM images show the lateral view. The CT-reconstructed model is presented and 3D surface deviation maps are compared with the CAD model for (B) the graded pentamode lattice, (C) the diamond lattice, (D) graded diamond lattice and (E) pentamode lattice. (F) Statistical surface deviation distributions are plotted. (G) Design freedoms of topological structures with different D/d and B/T are compared.