Monitoring ink flow

A system for monitoring ink flow, comprising:

• a printhead comprising a printhead die, wherein the printhead is configured to perform a priming event;
• a heating element coupled to the printhead die;
• a plurality of sensors coupled to the printhead die, respectively positioned adjacent to a plurality of nozzle groups within the printhead die;
• wherein a sensor is configured to confirm when the printhead die has reached a start-priming temperature, and
• wherein the plurality of sensors are configured to make priming measurements of temperature of the printhead die at a plurality of times;
• a processor coupled to the heating element and the plurality of sensors, wherein the processor is configured to:
• calculate actual cooling rates for the nozzle groups utilizing the start-priming temperature and the priming measurements, and
• determine success of the priming event for the nozzle groups by comparing the actual cooling rates to a threshold cooling rate.

A non-transitory computer-readable medium having computer executable instructions thereon which, when executed, cause a processor to perform a method, the method comprising:

• utilizing a heating element and a sensor to raise temperature of a printhead die to a start-priming temperature;
• performing a priming event;
• utilizing a plurality of sensors, respectively positioned adjacent to a plurality of nozzle groups, to make priming measurements of temperature of the printhead die at a plurality of times;
• calculating actual cooling rates for the nozzle groups utilizing the start-priming temperature and the priming measurements;
• and
• determining success of the priming event for the nozzle groups by comparing the actual cooling rates to a threshold cooling rate.