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CAD models of TPMS unit cells. (a) Unit cell with 0.1 relative density and level-set parameter c = 0. (b) Unit cell with 1:1:2 aspect ratio. (c) Zero-thickness surface representations of unit cells with varying level-set parameters (c). The arrow marks the direction of increasing c values, with the c = + 0.2 surface on the outside and c =-0.2 on the inside.
