a plurality of supply tubes configuring a supply flow path of the liquid to the plurality of printers, the supply tubes being connected to a tank configured to store the liquid, the tank being positioned outside the plurality of printers and provided further upstream than the plurality of printers in the supply flow path, and the supply tubes configured to supply the liquid from the tank toward the plurality of printers; and

an agitator including a stirrer and configured to perform an agitation operation, the agitation operation being an operation of driving the stirrer and agitating the liquid inside the tank.