The Wuxn Calibration Cube is printed to confirm dimensional accuracy and print quality of the Wuxn WXR 3D printer. Place a 608ZZ ball bearing into the top of the cube. The bearing should fit snugly and not fall out, due to gravity, when turned upside down.
The length, width, and height of the cube should measure 30mm respectively. Using a pair of calipers, measure the three lengths to determine if the tolerances are +/-0.1mm.