When you replace the print head and the counter is cleared, the value of [Head 2] appears in [Head 3], and the value of [Head 1] appears in [Head 2]. [Head 1] will start to count from 0 again.When you replace the belt and the counter is cleared, the value of [Belt 2] appears in [Belt 3], and the value of [Belt 1] appears in [Belt 2]. [Belt 1] will start to count from 0 again.When you replace the belt and the counter is cleared, the value of [Belt 2] appears in [Belt 3], and the value of [Belt 1] appears in [Belt 2]. [Belt 1] will start to count from 0 again.