Painless Microneedles: Limpet Tooth-Inspired Painless Microneedles Fabricated by Magnetic Field-Assisted 3D Printing (Adv. Funct. Keywords: 3D printing; limpet teeth; magnetic field; mechanical reinforcement; microneedles EN 3D printing limpet teeth magnetic field mechanical reinforcement microneedles 1 1 1 01/29/21 20210127 NES 210127 In article number 2003725, Xiangjia Li, Yang Chai, Yong Chen, and co-workers present limpet tooth inspired painless microneedles with the capability of controllable drug delivery. 3D printing, limpet teeth, magnetic field, mechanical reinforcement, microneedles. [Extracted from the article]