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Hi guys and gilrs!

because of the weight of the extruder, my rods bend due to gravity.
So the nozzle heigt at the edges of prindbed is about 0.2/0.4 mm higher than at the center.

If I measure the removed rods, they are straight (enough).

I tested also new rods that are straight. No difference.

Has anybody a solution?

Or can anybody tell me how to flash Marlin to copensate this (maby with mesh leveling)?
The pictures show the board of my printer.