The bioprinter configuration had two holders for pneumatic printing, so inks were exchanged during multi-material prints, like the diodes integrated into the strain stiffening structure. A separate stl files were designed for each material. The 3D models were made using Microsoft 3D Builder. For the resolution comparison in Figure , a nozzle with 0.41 mm inner diameter, a pressure of 100 kPa, and a printing speed of 20 mm/s was used. For other prints, these parameters were adjusted to attempt to most closely create the desired structure. The printing direction of the infill lines was rotated 90 degrees every layer, creating a perpendicular pattern with the layers above and below.