(A) Schematic illustration of the embedded 3D-printing process in which conductive ink is printed into an uncured elastomeric reservoir; (B) Photograph of e-3DP for a planar array of soft strain sensors; (C) Top and cross-sectional images (a) of soft sensors, and electrical resistance change as a function of cyclic deformation (b), step deformation (c) and mechanical failure (d); (D) Photograph of a glove with embedded strain sensors (a) produced by e-3DP, electrical resistance changed as a function of time for strain sensors within the glove at five different hand positions (b), and photograph of a three-layer strain and pressure sensor (c). Reproduced from [7], with permission from WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany, © 2014.