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. 2018 Jul 3;6:19. doi: 10.1186/s41038-018-0121-4

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 11 — A new strategy for material extrusion additive manufacturing in which the speed and height of the print nozzle were changed to achieve accumulation or thinning of extruded silicone hydrogel. a The concept of raising the nozzle above the print bed and controlling the extrusion rate and nozzle speed. b The resulting printing characteristics achieved with various settings for non-dimensionalised parameters for print height (H*) and nozzle speed (V*). Figure reproduced with permission from the original article of Yuk and Zhao [62] (Copyright 2017 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)