Bed Levelling Guide
Much Too Close
Filament extrudes thin or not at all in some places, often bulging out in others. Extruder motor might slip / click.
A Little Too Close
Filament bulges out of the sides of the nozzle which squishes into other lines, sometimes causing a pattern.
Filament is flattened, adheres well to nearby lines, no gaps or peaks between lines.
A Little Too Far
Filament appears rounded, connection between lines is loose, gaps may appear.
Much Too Far
Filament is totally rounded, little to no connection between lines, doesn't stick to bed.