I had first layer problems after rebuilding after a really bad serious clumping I couldn’t get the first layer right so I tried tramming the bed but the first time didn’t make much difference so I heated the bed to 50C and nozzle to 150C and adjusted the 3 screws on the bed using just paper to just grip under the nozzles on the three corners using the Gcode (manual screws adjust a1). Surprisingly it did the trick and the prints are good now. I might add you have to loosen the two screws on the side before you start
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