A decent fitting fan mount but the screw holes could be better positioned. And It could stand to be longer. I will start from scratch when fixing it. On the Dual print head assembly, It only fits from the front. And you must angle them towards the middle for 2 of them to fit. The next version will fit one fan to both Print head cooling fins. I believe a single 40mm fan provides sufficient airflow for 2 J-heads.This is in metric. The screw holes are a bit wide. But it makes so that Two M3 screws go in at a slight angle. Then tighten up securely without nuts.