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. 2021 Jun 22;13(7):924. doi: 10.3390/pharmaceutics13070924

Figure 6.

Figure 6

The working principle of powder bed technologies (selective laser sintering, SLS; direct metal laser sintering, DMLS; and selective laser melting, SLM). (a) Fabrication of microneedle arrays using DMLS and post-processing by electropolishing. Reproduced with permission from [156], John Wiley & Sons—Books, 2020. (b) Fabrication of hollow microneedle using SLM. Reproduced with permission from [158], Walter de Gruyter and Company, Berlin, Germany, 2012. The image was created with Adobe Illustrator CC (Version 23.0.1.; Adobe Inc., San Jose, CA, USA, 2019).