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. 2022 Jul 19;12:12294. doi: 10.1038/s41598-022-16008-6

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© The Author(s) 2022

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Automatic pick-and place-operation, showing (i) the pick-up, (ii) transfer and (iii) placement of the printed objects to the targeted micro-wells. The printed objects composed of 6 w/v% gelatin and 1 w/v% alginate were stained with sodium fluorescein and a UV touch was used for illustrating the objects. (b) In-air printing of (i) a Pluronic F127 ink and (ii) multiple Pluronic inks stained with different colours. (c) Embedded printing of a sodium hyaluronate ink in a Carbopol bath and (ii) multiple alginate inks stained with different colours in a xanthan gum bath for forming a lung structure. Scale bars = 5 mm.