Anycubic i3 Mega (S) Mainboard/Stepper Fan Duct - 50mm and 40mm

thingiverse

I customized this fan duct to work seamlessly with the stock 50mm fan using M3 screws that feature slots for nuts to make attaching the fan a breeze. Next, I created a version with the original hole size to accommodate the Noctua rubber mounting system, as well as both 40mm and 50mm versions. I also removed the cutout on the shroud, relocated the air hole on the end piece, and extended the mounting bracket on the end piece so it can be pressed snugly against the side of the case. To make installation a snap, I discovered that sliding the long part of the duct under the necessary wires sideways is the easiest way to go. Then, you simply rotate it into place. With the duct positioned against the power supply, you can easily rotate the end piece into position and slide the duct until the mounting hole lines up perfectly. If needed, you can always remove the power supply for a hassle-free installation.