M3 nuts, with lengths of 6 mm, 8 mm, and 16 mm respectively. You may need to conduct some experiments to find the most suitable hexagonal head, as there are issues with dimensional tolerances.

In order for these nuts and bolts to be immediately usable without needing to adjust the size, you must use a 2 mm nozzle and a minimum layer height. I also used Bambu Basic filament. Finally, I used a smooth print bed to ensure maximum adhesion, as the textured PEI print bed is not sticky enough to prevent the screws from falling off.