Ender 3 Motherboard cover for 70mm fan

thingiverse

Edit: Added a second model with 5mm deeper fan mounting for better motherboard clearance and doubled the number of vents for airflow. Just in case that would cause troubles for anyone that prints it. The original fan for the motherboard cover started to become really noisy, to the point where it was the single loudest source except the steppers on the printer. I've been wanting a larger fan anyway so it can run with less noise and better cooling. I have loads of old PC fans from various things over the years, and I settled on an old CPU fan from a stock AMD cooler. The fan is 70mm and makes a perfect fit. I had to zip-tie the cables inside the motherboard enclosure together so they don't stray into the fan. 70mm is about the limit of size that will fit without having the fan itself sitting entirely exposed on top of a lid for the enclosure.