Prusa MK2MK2SMK25MK3 R3 angled fan nozzle duct remake
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Prusa MK2/MK2S/MK2.5/MK3 R3 angled fan nozzle duct remake

This is the original fan duct of MK3 but I modified the middle 2 openings to make them a little bit smaller on the models ...

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Prusa MK2/MK2S/MK2.5/MK3 R3 angled fan nozzle duct remake alternatives