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If it actually is residue from the material you were trying to print, pressed against the surface so tightly and so thin that you can't separate it, the best way to remove it is printing a new object on top of it, using the same material, with the bed properly leveled (i.e. not smashing the nozzle into it again) and with the bed and nozzle temperature high. ...


The absolute best way to solve sticking problem is Overture build surface. I could not get anything to stick. Got a free build sheet when I bought some filament from them. What a difference, everything sticks now, just clean with alcohol between uses.


My guess is it's damaged print surface from the hot extruder mashing against the print surface. Your description seems to indicate that it isn't a layer.

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