A printing system and a printing method are provided that automatically determine a preferentially executed print job to perform printing when a requested number of prints exceeds an upper limit value of permitted number of prints. Further an electronic control system is provided comprising a microcontroller and power source, the microcontroller comprising electronic filtering means for attenuating irregularities in the signal from the sensor means and computing a wheel revolution count based on said attenuated signal, and output means for communicating the wheel revolution count. Each pixel row has a plurality of sub-pixels. One or more optimizations are applied to the operations.