To attest to the potential of multi-material 3D printing to rapidly advance iontronics, we demonstrated a device with iontronic functionality and advanced mechanical properties that was fabricated using a single process. Neither the electrical behavior nor the mechanical behavior represents the bulk properties of a material. Instead, the electrical behavior arises from the interaction of different materials and is accomplished by multi-material printing, and the mechanical behavior arises from the specific printed geometry. This demonstration opens the door to much more complex iontronic devices that can be achieved with multi-material 3D printing. This work is intended to provide a guide for the rapid and informed development inks that suit their specific application and support the development of more advanced soft electronics. By providing insights into the impact of specific components and the extrusion printing process, we believe this foundation can also be extrapolated to support other materials and fabrication methods.