Edges curling

  • E3 V2
    EN-PLA 205C/60C (first layer 210C using Prusa slicer)

    After about 30 mins - 1 hour some edges curl on a large rectangular part.

    I think expansion/contraction is the problem, but I don't know how to fix it.

    There maybe poor adhesion of the first layer, but I've waited 25 days for the BL-Touch I ordered from Creality UK so I'm stuck with manual levelling atm.

    Any suggestions?


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