roller

@user_6282638282 yeah, when its stuck hard sometimes it just wont come off. Ive killed a couple of beds like that. Basically do the opposite of getting better adhesion! Thinner first layer, lower temps, larger nozzle offset etc

@user_6282638282 I've had similar problems. It may be the coating has been removed from the bed. It happens when filament sticks too much, PETG is pretty bad for it. I tend to leave my bed to cool so the piece pops off itself. That doesnt always work. Following other advice to reduce adhesion like bed temp, offset etc may work.