MiniMe lightweight Ender3 Hotend Duct for 50x20 mm Radial fan
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Mini-Me lightweight Ender3 Hotend Duct for 50x20 mm Radial fan

Modified version to improve heatsink cooling and to fit 50x20 mm radial fan models ...

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Mini-Me lightweight Ender3 Hotend Duct for 50x20 mm Radial fan alternatives