The calibration cube is a basic geometric object, usually a solid 20x20x20mm cube (often called the "20mm cube").

Key Design Elements
Dimensions: The main characteristic is that all its faces must measure exactly 20 mm (or the measurement specified in the file, although 20 mm is the standard).

Axle Markings: To facilitate measurement and diagnosis, each of the visible faces usually has a letter engraved or extruded to identify the axle:

X for the lateral movement axis.

And for the front/rear movement axis.

Z for the vertical movement axis.

Additional Features (in advanced versions): Some calibration cubes include small details for testing other settings, such as:

Overhangs: Small areas that protrude to test cooling and printing angles.

Bridging: A small horizontal space printed in the air to test the printer's ability to "bridge" without supports.

Holes or Slots: Small openings to measure dimensional accuracy.

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Creality

Ender 3

No

No

0.2

15