Hopefully you understand the difference between "flat" and "level". If not look it up or think about it.
Just because your bed is flat doesn't mean your gantry is. Sometimes the entire printer is warped during shipping and one corner is or lower than the other 3 causing the print head to also be lower or higher in that corner. You c an try bending the frame back or you can try putting a shim under the glass such as a washer or pieces of paper. First you have to understand the problem exactly (where are the high/low spots even after leveling perfectly at the 3 screws).
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rebekah_harper 60
here is an image of what I am trying to solve
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