In contrast to polymer solutions, flows of malleable metals and colloidal flows have robust a priori frameworks for describing flow which include thermodynamics. In the more mature field of metal extrusion, for instance, thermodynamics and dynamic materials models determine both microstructure and macroscopic behavior at different processing conditions, with hundreds of different alloys well-described . In colloidal science, the jamming phase diagram characterizes thermodynamic phases, describing under which conditions suspensions are in a liquid or glassy state . The basic jamming diagram outlines the impact of colloid concentration, interparticle interaction, and forces applied to the system in determining the state of the material. Exploiting thermodynamics can control macroscopic flow behavior: applying and removing shear causes transitions from liquid to solid in colloidal hydrogels for use as bioinks or in support baths of 3D bioprinting applications . However, we have not seen any similar frameworks describing the transition between flowing and clogging in the confined flow of crosslinking polymer solutions.