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Improved calibration prints with minor modification to connect all the printed squares for easy removal from the bed. (uses a 0.4mm line width)

These prints work seamlessly with the instructions with the original model linked below:

https://www.printables.com/model/213992-perfect-1st-layers-ender-3-v2-ender-3s1-ender-3s1-

Note: When you want to fix a specific spot on the mesh use the STLs which have only the edge corner or edge middle square. Its a 1min print and you can rotate it in slicer to cover any of the 8 outer squares of a 3x3 print. Really good if you have a particular spot you want to perfect and want to iterate quickly and don't want to reprint the entire 3x3 grid.