A custom calibration test cube I made. I tried to get every kind of surface and angle I could in one cube.

Top: rounded corners, squared corners, circles and round edges, text clarity Front: Z-axis ghosting, definition, text clarity, scale (each notch is 1mm tall) Left: printing angles, angle smoothness, overhangs Right: X-axis ghosting, definition, text clarity, scale (1mm tall) Back: recessed printing, overhang, circular printing across layers Bottom: first layer shape, overhang