Test Square 160 x 160 1mm

thingiverse

This is a straightforward test print that should appear dead center on your bed, allowing you to verify if your extruder or bed is properly aligned and printing straight lines. Once printed, you can simply measure from the edge of the print to the edge of your bed to see if it's centered. The design prints a 6.3 inch square with a thickness of 0.04 inches, giving you an even measurement from each side to the bed's edge and enabling precise calibration checks.