Review: Progress on 3D printing technology in the preparation of flexible tactile sensors

3D printing technology, as a flexible and efficient manufacturing method, provides new possibilities for preparing flexible tactile sensors. This paper reviews the preparation results of flexible tactile sensors based on 3D printing technology. Three types of 3D printing technology commonly used in preparing flexible tactile sensors are first described: photopolymerization, material extrusion, and electrohydrodynamic. Under the process corresponding to each type, suitable printing materials are discussed, and their applications in flexible tactile sensors preparation are explored. On this basis, the effects of these three types of processes and printing materials on the performance of flexible tactile sensors and the related application progress are analyzed. Finally, the challenges and opportunities of flexible tactile sensors based on 3D printing technology are summarized, and the future development trend is prospected.