The parameter space involved in bioprinting is large and many factors contribute to preventing clogging and achieving a successful print. Leaving aside biological considerations, such as the presence and survival of cells, bioinks must have proper rheological properties to flow through small channels without clogging while also providing sufficient structural support to retain an appropriate shape upon leaving the channel. While high viscosity solutions are preferred for shape retention, they also require large forces to move through the nozzle, resulting in high shear stresses. If the viscosity is sufficiently high, 3D printers may not have sufficient driving pressure to maintain flow, resulting in a failed print. Highly viscous materials, particularly those which shear thin, may be too viscous to pump at low flow rates . Similarly, yield stresses above certain limits impede successful printing . Shear thinning can overcome these challenges and facilitate the pumping of viscous materials. Once flow is stopped however, any pump must overcome the increased viscosity caused by the low shear rate and the yield stress of the material.