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The printer controller's A to D input is ratiometric. In other words, it measures the input voltage relative to the supply voltage. So if the filament sensor is set to ratiometric, it is also relative to the supply voltage, in effect cancelling out the impact of varying supply voltage, or a supply voltage different from 5v. For example, In ratiometric mode, the sensor outputs 50% output for 2.5mm and 100% output for 5mm. If the supply is 5v then its 2.5v and 5.0v out. If the supply is 4.8v its 2.4v out and 4.8v out. At the input of the printer controller, an input of 50% is interpreted as 2.5mm and an input of 100% is interpreted as 5mm.