"then the nozzle dips into the blob". Hmm. I'm not sure that's what I see: I see a x-y move to the approx center of the bed while the bed is being raised. I believe the idea is to lay the priming material in a run along the glass where it hopefully starts the brim.
In practice the xy-move leaves a wisp of material hanging loose. I've had occasions when the print head catches this and peels part of the print off the table. So, I prefer to be there when the filament is priming, allowing it to fall between the points of a pair of tweezers. When the xy-move starts I pinch off the primed material and dispose of it. Seems to work ok.
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zaski 0
It is in the gcode. It happens only with Cura.
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