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