Ender 3 PSU Cover - 80 mm Silent Fan by Denevraut - Thingiverse
Ender 3 LRS-350-24 PSU Fan Upgrade and Tests : r/ender3
ender 3 80mm STL Files for 3D Printers
Ender 3 (Pro/V2) Fan Upgrade / Replacement | All3DP
PSA: If your Ender 3 has an S-360W-24-L PSU and its pretty loud, check the fan voltage. They are sometimes using 12/14V fans running at 24V! : r/ender3