M5 nuts bed level and mark for re-level

I think It speaks for it self. M5 nut adjuster and a external circle mark.

The mark is to know in what position the nut was set, so when the nut moves for the vibration of printing you know the exact position it was and just move the adjuster back to the right position.

I use the marks looking at front, but you can do what you like.

Use brim (3 mm) when printing the circles marks, there are every hard to stick to the bed.

print four of each.