Ender 3 main board cover with integrated organic-looking fan duct.
"I hate how that thing looks" - my trypophobic wife.
As per the original design by Hometinker12, the fan has been moved to accommodate the BLTouch Pin 27 adapter. I also removed the side notch for the Z-axis limit switch cable (since the BLTouch does that), and removed the screw posts so it could print without supports. It's likely that a couple longer screws will be required because of that modification.
Using Cura's dynamic settings, it took about 15 hours to print.