This is my attempt at creating (relatively) compact one piece solution for both part & cold end cooling of Chimera hotend.
Personally, I have a random chinese copy, and all the measurements are based on that.
All the measurements turned out better than expected on the first print, although the radial fan screw holes could be one mm off or so - should still work though.
Still waiting for some parts before I can install mine, before I have finished my version, this will be marked "work in progress."
NOTE: Since this design goes quite a bit "behind" the hotend, if you want to maximize print height, you will need X axis, that has quite a bit of distance towards the Chimera. I'm still working on one.
Since some parts of the design go very close to parts that do get hot, ABS is recommended.
The part is designed to print without supports. Especially for the part cooler part, since it would be impossible to get them off after the print is finished (unless you use water soluble materials, of course).
You can use supports for other parts, the top fan duct will look rather crappy on the inside, but it printed "functional enough" for me, without any supports.
My printer has issues with ABS not sticking properly, if there's much "zig zag" pattern in the lowest layer. To get better first layer, I used a raft. You might not need to. In any case, you will see quite soon, if the part is going to fail or not.