I wanted to make a fan duct for the Kraken that should fit on any printer. It mounts in between the top of the Kraken and whatever mount you used. To provide room for the fans a spacer is included which can be scaled vertically to accommodate whatever height fan you use or to provide clearance for other parts of your printer.
Print either the regular version (which has 0.5mm walls and may not come out well near the top, see picture) or the thicker version which as 1mm walls. Attach your fan and measure for clearance. Scale the spacer if needed (height is 10mm, scale as needed). Attached with 3mm bolts. Enjoy.