Ender 3 cpu fan cover with rear positioning
thingiverse
Edit 11/22/2019: I've crafted another version with baffles designed to dampen noise further. A photo illustrating how these baffles are positioned can be found below. Please note that, although the fan doesn't appear to be straining in pulling air through it, exercise caution when using this setup. I've built a duct to safeguard the cpu fan while it draws air from the printer's rear rather than its front. This modification aims to mute the cpu fan's noise output, and it succeeds remarkably well by baffling it more effectively than when it faces forward. Three screws used originally to secure the lid on the cpu box are repurposed in this design.
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