This nice model is useful to check and improve the leveling of your whole print bed. It is not a first layer calibration. You should run the build in calibrations first and use this model to check your whole plate.
We print this test like the first layer proof with an infill angel of 0° to make the smallest issue visibly.
If you find in your print areas where the lines are not connected or the print is not well bond to the bed you have a lot of options.
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