Bed Leveling 30x30 Square

So, I've had always the same problem, which was, when i printed the usual bed leveling that you find everywhere with the squares, if you have one square that is not leveled you have to do everything over again from the start, so i just made a simple square, with the initial height of my settings on Cura (0.2mm) and i created a file for every corner and middle (5 in total).

This way i can print a square, adjust the level of my bed on that corner, and print again that square...I dont need to wait to print all corners again, or waste a lot o filament.

In the first photo, if you find the square with that lines, it means that you have to raise your bed a little, till you get the same result as the second photo, which is the sweat spot for me