Robo E4 Pro: Sensor Calibration

Make sure you complete Z-Axis Calibration prior to doing Sensor Calibration. That article is available here: Robo E4 Pro: Z-Axis Calibration 

Tools/Calibration/Sensor Calibration

Rotate the indicated dial either clockwise or counter-clockwise according to the instructions on the screen. There is a dial under each corner of the build plate. 

For the first time, rotate the dial half of a turn to see how much that changes the value. Click "Verify" to test your new distance. Repeat until all 4 corners are level relative to each other.

Once all 4 corners are level, the printer will have you test the friction in the middle using a regular piece of paper like we did during z-axis calibration.