Print the ArUco marker

1. In the print dialog set scale to 100% (Actual size). Don't use "Fit to page".
2. After printing, check with a ruler that the black square is exactly 5.0 cm wide. If it isn't, enter the real size on the home screen.
3. Keep the white margin around it and lay it flat next to the object.

5 cm check

Dimension Capture · ArUco DICT_5X5_50 · ID 0 · 5 cm × 5 cm