This publication relates to a bed leveling measurement which is much faster and at a higher resolution as compared to known methods. The nozzle of the printer is put into contact with the surface of the bed and is then moved between several anchor points. By continuously reading the change in e.g. an accelerometer, we can measure the deformation of the bed, since if the bed is higher, it is pushed down, leading to a spike in the accelerometer.
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van Kessel, Jaime, "Print Bed Level Measuring in FFF Devices", Technical Disclosure Commons, (November 28, 2021)