Here, a bioinspired microneedle array is fabricated using magnetic field-assisted 3D printing (MF-3DP). Micro-bundles of aligned iron oxide nanoparticles (aIOs) are encapsulated by polymer matrix during the printing process. A bioinspired 3D-printed painless microneedle array is fabricated, and suitability of this microneedle patch for drug delivery during long-term wear is demonstrated. (https://advanced.onlinelibrary.wiley.com/doi/full/10.1002/adfm.202003725)
