A really quick calibration cube for calibration of x,z,y steps/mm and overflow/filament extrusion issues.

Cube Dimensions:

Width = 20mm
Depth = 20mm
Height = 20mm
Wall Thickness = 0.8mm

This cube will work with a 0.4mm Nozzle.

Adjust step/mm if x,y, or z dimension is off by quite a bit.
Adjust overflow until wall thickness is 0.8mm. (make sure E-steps is calibrated first)