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. 2020 Jun 17;8:609. doi: 10.3389/fbioe.2020.00609

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Copyright © 2020 Chen, Han, Wang, Liu, Chen and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Units of various non-parametric and parametric designs. (A) The body-centered cubic (BCC) unit and its modified units. a¹: BCC unit. (a²) A type of modified BCC unit by Adding vertical stiffeners through the center of the BCC/OC unit. (a³) The BCCZ unit. (a⁴) The pillar BCC. (B) The Diamond unit. (C) The Octet unit. (D) The rhombic dodecahedron unit. (E) The rhombic cube octahedron unit. (F) The Honeycomb units. (f¹) The commonly Honeycomb unit. (f²) The modified Honeycomb unit. (G) A new type Honeycomb unit. (g¹) Positional relationship of adjacent layers of new type Honeycomb unit. (g²) Structural characteristics of the layered slice and rod-connected structure of new type Honeycomb unit. (H) The Voronoi units. (I,J) The classification of TPMS. (I) The surface dominated by stretching. (i¹) Primitive surface. (i²) I-WP surface. (J) The surface dominated by bending. (j¹) Diamond surface. (j²) Gyroid surface.