Iontronics (or ionotronics) is a growing field that uses ions as charge carriers rather than electrons, allowing the utilization of non-traditional materials, like hydrogels, to create viscoelastic conductive devices. Because biology also often uses ionic current for signaling within soft tissue, iontronics supports the development of bio-inspired technology that matches the mechanical and conductive properties of biology. Whereas traditional electronics require rigid materials that do not interface ideally with nature, iontronics can be tuned according to their surrounding and purpose. For example, soft robotics developed for environmental sensors can minimize potential damage to natural environments compared to plastic and metallic robotics. The advancement of iontronics has led to the development of soft electronic devices that include wearable sensors, drug delivery devices, self-healing electronics, energy harvesters, ionic diodes, ionic transistors, and more. While there is no shortage of iontronic components, integrating these within more complex circuits remains challenging due to fabrication limitations. For example, ionic diodes, a basic component for logic gates and more complex circuits, require several materials (an anion selective hydrogel, a cation selective hydrogel, a conductor, and encasing) that are generally assembled by hand or within microfluidic channels. While fabricating, molding, cutting, and arranging the components of a single diode may be reasonable, this becomes increasingly impractical as the circuit becomes increasingly complex. The ionic diodes formed within microfluidic channels also require many fabrication steps, from designing and making the channels, to filling the channels with one desired material, polymerizing that structure with a mask, washing, and then repeating with each subsequent material. Furthermore, because the microfluidics provide a fixed geometry, rapid iteration remains very limited. These established methods hinder the development of soft iontronics with computational capabilities for implantable and wearable devices. As a nascent field, iontronics lacks a well-established and widely applicable fabrication method. We suggest that multi-material 3D printing can provide a rapid and versatile method for fabricating and iterating iontronics.