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It's copper grease that is used as a lubricant at the junction of the steel nut and aluminum plate, to prevent corrosion and ensure that the nut can be turned easily.
(And btw, technically, that's not usually called the extruder. It's the printhead or hot end. The extruder is really the black plastic filament drive part on the back of the printer - although to avoid confusion I tend to refer to that as the 'feeder assembly' these days.)
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illuminarti 18
It's copper grease that is used as a lubricant at the junction of the steel nut and aluminum plate, to prevent corrosion and ensure that the nut can be turned easily.
(And btw, technically, that's not usually called the extruder. It's the printhead or hot end. The extruder is really the black plastic filament drive part on the back of the printer - although to avoid confusion I tend to refer to that as the 'feeder assembly' these days.)
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