To evaluate the influence of temperature on the rheological properties of the inks, the shear thinning and thixotropy experiments were repeated at 22 ºC (Supplementary Information, Figure ). At this temperature, all the samples (even those with 0% CBP) produced well-defined gels that passed the inversion test (Supplementary Information, Figure ), although samples without CBP did not form robust filaments when extruded. The trends for G', G", viscosity, and thixotropy were similar at both temperatures (Supplementary Information, Figure ). Higher concentrations of GelMA or CBP resulted in increased G', G" and viscosity while the inks also presented thixotropy and fast recovery. As expected, given the gelation (physical crosslinking) of GelMA at 22 ºC, when evaluated at this temperature the inks showed higher modulus and viscosity.