Or there may be irregularities in the bed or nozzle height due to mechanical flaws. Most beds appear quite flat and even, but even when the bed is flat, there may be irregularities due to tape or other matter on the surface. The information on this page only fully applies to ABL.Īutomatic Bed Leveling (ABL) helps improve the quality of printing and bed adhesion by taking several measurements of the bed surface and then adjusting all movement to follow the tilt or contours of the bed. Marlin also includes Unified Bed Leveling and Mesh Bed Leveling which have their own unique options.