Ender 3 Electronic Box cover with 70mm / 80mm fan

thingiverse

Replacement electronic box cover with a 70mm or 80mm fan is available. The electronic box's fan has two major issues. First, the fan is linked to the part cooling fan, meaning if you don't use your part cooling fan, the electronics won't get cooled. Second, it's loud, and I intend to make my printer as quiet as possible. That's why I designed this new lid cover for the electronic box. The reason for choosing 70mm is that I have several old AMD Athlon CPU-cooler fans lying around, and I didn't want to purchase an 80mm one. You don't need expensive Noctua fans to make your printer silent; you only need a couple of cheap buck converters. For example, my coldend cooling fan is still the original, but stepped down from 24V to 12V (and still provides enough cooling). The fan is fixed with some 3mm bolts, directly screwed into the plastic. You can use some 3mm inserts if you like (though you need to drill larger holes). The fan connects to the 24V rail on the mainboard or to the coldend fan. I stepped it down from 12V to 6V and it's quiet and provides enough cooling. An 80mm version has been added.