I have a E3D V6 Clone hot end on my A8, and wanted to use a 40mm fan to cool the heat sink. I also wanted to re-purpose the stock 30mm fan as a parts cooler since I'm printing PETG and don't need a ton of cooling, and wanted to keep the hot end assembly as compact as possible. This is what I came up with. It has been working great for me so far printing PETG. I have not tried printing PLA with it, so can't say if the parts cooling is adequate or not. If you try it let me know! :) I printed this with black PETG, for the extra temperature resistance and slight flexibility over PLA. (Makes it snap on easier, it's a sort of tight fit, intentionally so it doesn't move) This will not fit a genuine V6 as the outside diameter is different. My clone's OD is 22mm.
Print upside down, with the top surface on the print bed. You may need support under the one side where the 30mm fan goes, depending on how well your printer handles overhangs.