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. 2020 Jul 2;10(7):1300. doi: 10.3390/nano10071300

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Schematic diagrams of bulk solid-based AM technology main methods: (a) LOM; (b) FDM; (c) direct ink writing (DIW). Figure 5a,b adapted from [44], with permission from Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, 2018.