What we're technically calibrating is the stepper motor that is attached to the extruder unit, and the measurement we're calibrating is the steps per millimeter.

Most 3D printers on the market come with Marlin Firmware as stock, which refers to the steps per mm value as "E-steps" in the settings. They're the same thing.

You might be able to find this buried in your printer's settings menu on the LCD. Make a note of it. If it's not there, continue reading.

• This macro will dymanic change the bed_mesh area based on the size of the printed part. The fw will only probe on the area that the part will be printed (plus mesh_area_offset value)

• (1) Add the following macrro to your printer config, this will replace the default BED_MESH_CALIBRATE command.