3D‐Structured Stretchable Strain Sensors for Out‐of‐Plane Force Detection

3D‐structured stretchable strain sensors with a stretchable sensing unit and 3D stretchable structure are reported by employing 3D printing and out‐of‐plane self‐spinning of carbon nanotubes. The sensor possesses high stretchability, multistrain detection, and strain direction recognition by one single sensor. The study paves the way for next‐generation 3D stretchable electronic sensors for electronic skin and soft robotics.