Four-dimensional (4D) printing is one of the emerging technologies. The fourth dimension in 4D printing refers to the ability of 3D printed material objects to alter its geometric configuration from one to another in a fully controllable manner, thus providing additional functional capabilities and performance-driven applications. With the additional dimension, 4D printing is emerging as a novel technique to enable configuration switching in 3D printed items. The purpose of this paper is to briefly discuss the 4D printing and to review some applications to demonstrate the potential of 4D printing.
Yu-Ju Wu, "Four-dimensional (4D) Printing and Its Applications" in Proc. IS&T Printing for Fabrication: Int'l Conf. on Digital Printing Technologies (NIP33), 2017, pp 160 - 164, https://doi.org/10.2352/ISSN.2169-4451.2017.33.160