adhesion - FDM printer first layer infill swell upward - 3D

My Kossel Mini printer was working well. Recently I made some changes including replacing the nozzle and throat, adding a silicone heater cover. Now it has the problem of first layer adhesion. The

adhesion - FDM printer first layer infill swell upward - 3D Printing Stack Exchange

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adhesion - FDM printer first layer infill swell upward - 3D Printing Stack Exchange

Not Sticking to the Bed

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