WellFan  Mean Well LRS35024 ultra silent PSU mod for Ender 3
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WellFan - Mean Well LRS-350-24 ultra silent PSU mod for Ender 3

This is a PSU modification which is meant for the Creality3D Ender 3 but may be used for other printers too ...

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WellFan - Mean Well LRS-350-24 ultra silent PSU mod for Ender 3 alternatives