So this is my take on a water cooled replacement of the e3d-v6 heatsink. It is built to suit the 30x30mm footprint of the smallest blower fan I could find ( https://www.digikey.com.au/products/en?mpart=BFB0305MA-A&v=603 ). The block depth is 16mm to suit the external diameter of the groove mount, which also matches up well with 16mm bar stock. I am waiting on 90deg barbed fittings for the coolant lines but thought I would post what I have right now.
Looks nice. How does the inner barrel seal in the water block?
@Ryan_Carlyle JB weld. I’m not sure what its thermal conductivity is like but I expect there is enough cooling surface area directly on the barrel that it shouldn’t really matter if there is rapid heat transfer between the barrel and the block. I should do some calcs but that is what I do for a day job, so…
@Daryl_Bond you’re only trying to remove a couple watts iirc, I don’t think you need much surface area. As long as you keep the water reasonably cool anyway.
Nice one! Cooling will be way more than enough, don’t worry 
Yep. I’m following.
I’ll take two 
Very nice, hopefully the seal holds.