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Ender 3 Pro bed is lower in the middle

Glass beds are rigid, they won't sag in the middle after a few days, or months, or years. So the problem might be the undercarriage levelling equipment. The screws may be unwinding or slipping somehow....
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What could be the reason of under extrusion on some areas?

The most likely cause is that your bed just isn't flat. At least as I understand it, delta calibration is not mesh leveling, and is not there to correct for a non-flat bed, just for skew from the bed ...

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