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. 2020 Nov 30;6:107. doi: 10.1038/s41378-020-00216-z

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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. 2 — a Schematic diagram of the MFBB working principle. b Schematic side view of the integrated valves. c Realistic side view of the MFBB showing all four layers. d Realistic top view of the flow layer, containing the in- and outlets, the hydraulic resistors (layer ①) and the top part of the valves (layer ②). e Realistic top view of the control layer, containing the control channels (layer ③) and the bottom part of the valves (layer ④)