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. 2020 Feb 12;11:852. doi: 10.1038/s41467-020-14630-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — a Video snapshot during the printing of the artery without feedback. b Micro-CT scan of the printed artery (without feedback), rendered with transparency to show the occlusions. c Photograph of the printed artery (without feedback) perfused with a red dye, to visualize the open channels. d–f Corresponding data for the artery printed with feedback. g Digital model of the printed artery. A comparative video recording of the artery prints is available as Supplementary Movie 4. h Video snapshot, (i) micro-CT rendering, and j photograph of the hearing aid model without feedback. k–m Corresponding data for the hearing aid with feedback. n Hearing aid model. i and l show the deviation of the printed parts with respect to the digital model n, as measured by the micro-CT. The scale bars are 5 mm.