The 3D Touch automatic bed leveling sensor uses hall effect to achieve leveling. you can get the position of the point by touching it on the bed. It levels the hot end by adjusting the height of the Z axis, even if the printer is uneven.
This sensor can be fitted to most 3D printers to add auto bed levelling to the printer. All you will need are 3 extra pins on your controller board to drive the sensor.
It has a polycarbonate pin which extends lower than the nozzle when the sensor is required to measure the bed. Then the printer probes the bed. As soon as the pin touches the bed it retracts and sends the signal to the Z end stop switch on the controller board and the printer knows the height of the bed at that point. This sensor measures the bed mechanically, so it is not affected by the type of material used as printing surface, bed temperature or metallic / non-metallic bed.
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