Control device that predicts residual quantity of printing material in cartridge currently mounted in printer

A method for a control device including a controller, the method comprising:

• acquiring a first value from a printer under a condition where a first cartridge is mounted in the printer, the first value being related to a residual quantity of printing material remaining in the first cartridge at a first calendar date;
• acquiring a second value from the printer under a condition where a second cartridge is mounted in the printer, the second cartridge being attached to the printer later than detachment of the first cartridge, the second value being related to a residual quantity of printing material remaining in the second cartridge at a second calendar date;
• estimating a third calendar date using the first value, the second value, and a time interval between the first calendar date and the second calendar date, the third calendar date being a calendar date when a third value related to the residual quantity of printing material remaining in the second cartridge is assumed to be smaller than a prescribed quantity;
• and
• executing an output process according to the third calendar date.

A control device comprising:

• a controller configured to perform:
• acquiring a first value from a printer under a condition where a first cartridge is mounted in the printer, the first value being related to a residual quantity of printing material remaining in the first cartridge at a first calendar date;
• acquiring a second value from the printer under a condition where a second cartridge is mounted in the printer, the second cartridge being attached to the printer later than detachment of the first cartridge, the second value being related to a residual quantity of printing material remaining in the second cartridge at a second calendar date;
• estimating a third calendar date using the first value, the second value, and a time interval between the first calendar date and the second calendar date, the third calendar date being a calendar date when a third value related to the residual quantity of printing material remaining in the second cartridge is assumed to be smaller than a prescribed quantity;
• and
• executing an output process according to the third calendar date.