To enable DIW printing of the LAL polymer at elevated temperatures, we integrate a heated extruder into a customized linear driving stage (DIW Printing in SI Materials and Methods). The heated extruder consists primarily of a metal syringe surrounded by a heating jacket and a stepper motor that mechanically drives the syringe plunger to control the rate of extrusion. We directly load chunks of the solid LAL polymer into the syringe barrel, heat the syringe to 170 ºC, and extrude the polymer onto the build plate that is maintained at 80 ºC. The combination of precise control over extrusion speed and temperature produces smooth and continuous extrusion of LAL filaments. The extruded filament rapidly resolidifies after exiting the nozzle due to a combination of cooling and the material's yield-stress behavior, as shown by a representative image in Fig. .