While the work presented here provides demonstrations at a relatively large size scale for electronics, smaller devices could be fabricated using smaller nozzles for better printing resolution or using other printing methods. Two-photon polymerization has recently been used to 3D print PEDOT:PSS laden hydrogels at the microscale. While it is exciting to advance iontronics on the microscale, multi-material printing is even more challenging using such resin-based printing methods. LED, the LED is illuminated. D) When the applied potential is reversed and the LED is reversed accordingly, the soft diodes limit current and the LED does not become illuminated. E) Illustrations and images aligned with a force-strain plot to demonstrate that the extrusion printed electronics could be incorporated into a wearable device. i) At low strain, the device is very flexible and can be extended with little force, allowing the joint to move freely. The electronic circuit powers a light indicating normal activity. ii) The steepening of the slope at the critical strain around 35% highlights the strainstiffening behavior of the 3D printed design. With moderate strain, the device stiffens to help prevent overextension and injury. The power to the light remains unaffected. iii) When the joint is overextended and causes extreme strain, the electronic circuit opens and the light loses power to indicate a moment when there is a risk for injury. The process is fully reversible and the circuit will return to its previous state as strain is reduced.