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Swap in a hardened steel nozzle and keep your Neptune 4 Plus or 4 Max running with tougher filaments. The combo kit ships in three diameters — 0.4mm, 0.6mm and 0.8mm — so you can match the nozzle to the job at hand.
Reach for a smaller opening when a model needs crisp surface detail. Step up to a wider one when you'd rather push through layers and finish the print sooner. Both routes are covered here.
Hardened steel holds up better than brass against abrasive materials, which makes this kit a practical spare set to keep beside the machine.
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