Can someone help me? How can I improve my mesh in the corner?

I'm callibrating my V-Core 4 500, and I can't make these corners up. Any suggestions about how to improve my mesh? Thank you in advance. The corners looks to be in the back.
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Solution
Problem solved! I redid it after closing the 3D printer. Also I'm doing different meshes for different temperatures.
To recap: pushing gantry helped a lot. Also adjusting the back corners, and playing with the rubber legs too.
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