Start Code: G29 Explained
Auto Leveling is a process that allows a 3D Printer to create a digital map of the build plate by gathering data from key points in a Grid usually by a 3x3 or 9 Point grid system sometimes more depending on the build size.
The 3D Mesh generated looks something like this from a series of points the printer creates a map of points then bridges them together with flat faces allowing it to print on uneven surfaces as long as they are within tolerances. The Z will move up and down to account for these differences making the print come out normal.
To achieve this the printer requires a simple code entry along with a leveling sensor and the correct firmware.
If you have a probe correctly installed on your machine ensure that your Gcode Start up has the Following lines in this Order. The G28 command should already be in your start up code so you need only add the second line following it.
G28 ; Home The Nozzle
G29 ; Auto Level the bed