RoBo3D Autolevel via Mike Kelly

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Auto Bed Levelness Compensation (ABLC) is a process used in 3D printing to determine the level error of the bed and compensate for it by moving the Z axis up and down, without any mechanical variation but rather software compensation. Unlike Auto Bed Leveling, ABLC doesn't rely on mechanical action to adjust the bed levelness against the nozzle's movement. The RoBo 3D auto-level switch system works by utilizing the principle of coupling nuts unseating when the nozzle touches the bed. This activates a switch that sends a signal to the ramps board, indicating an endstop has been hit. In this modification, the switches are run in series to avoid failure situations. To use this modified auto-level feature, you need to change the firmware and configure the G-code accordingly. Calibration involves determining the Z offset between when the nozzle touches the bed and when the switches activate, followed by inserting specific code into your slicer's starting procedures for auto-calibration.