Material Extrusion‐Enabled Soft Multimodal Pressure Sensors With Fabrication‐Embedded Stretch‐Induced Strain Insensitivity

Key challenges in stretchable pressure sensors include establishing cost‐effective fabrication routes for soft functional materials, achieving strain‐insensitive performance under deformation, and enabling seamless integration into soft architectures. Here, electrospinning is combined with liquid‐based material extrusion ( l ‐MEX) and melt‐based material extrusion ( m ‐MEX) to fabricate stretchable pressure sensors with multimodal sensing capability. The sensing layer is composed of mechanically anisotropic electrospun poly(vinylidene fluoride) / thermoplastic polyurethane composite microfibers sandwiched between l ‐MEX printed stretchable silver electrodes, exhibiting a Young's modulus as low as 0.5 MPa. A three‐dimensional serpentine architecture reconfigures the sensing layer into a compliant geometry and enables system‐level stretchability while maintaining stable sensing performance under strain. In the capacitive mode, the optimized sensor achieves 97.6% strain insensitivity under strains up to 30% and a minimum detectable pressure of 0.04 kPa. In the piezoelectric mode, the same device exhibits a sensitivity of 16.5 mV kPa −1 and a strain‐insensitivity ratio of 85.4% at 10% applied strain. A stretchable capacitive sensing matrix enables uniform pressure mapping under strain. Integration of the sensors into a pneumatically actuated soft gripper further demonstrates real‐time piezoelectric responses. This work presents a scalable and automatable manufacturing route for integrating soft functional materials into stretchable electronics and soft robotic systems.