MK3S upside down Extruder Nozzle blower (fan shroud) adaper and extruder cover
thingiverse
I'm puzzled by the Nozzle blower's behavior, as it's drawing in hot air from the heated bed. To rectify this, I've turned the Nozzle blower upside down and paired it with my Bowden Tube Blower to ensure sufficient cool air is flowing out of the extruder. This required extending the fan shroud and installing an updated fan support. An optional but beneficial upgrade would be a revised extruder cover featuring a sealed venturi hole, removed arm, and a "bite" taken out of the front for improved airflow when utilizing a blower for the extruder - all this being built upon the original ButterworthDesign (https://shop.prusa3d.com/forum/user-mods-octoprint-enclosures-nozzles--f65/modified-c1-r4-mk3s-parts-better-filament-path-and-t28334.html#p133592).
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