Fig. 2.

Views of extruded filaments from the +y direction after 1 s of extrusion, where the support is Newtonian. Surfaces indicate the interpolated interface between ink and support, where the volume fraction of ink is 0.5. Colors indicate the magnitude of the velocity at the interface. Blue vertical cylinders represent the ink inside of the nozzle. (i) Viscosity ratio dominates. (ii) Surface tension dominates. Dashed lines indicate trends in controlling variables (viscosity ratio or support viscosity). (A) Newtonian ink. (B) Herschel–Bulkley ink.