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The working principle of stereolithography (SLA) and digital light projection (DLP). (a,b) Microneedles manufactured by SLA. Reproduced with permission from [122,123], Springer Nature, 2019 and MDPI, 2018. (c,d) Microneedles manufactured by the DLP technique. Reproduced with permission from [124,125], IOP Publishing, Ltd., Bristol, UK, 2015, 2020 The image was created with Adobe Illustrator CC (Version 23.0.1.; Adobe Inc., San Jose, CA, USA, 2019).
