Looks like you can print it. But there is one more issue to tackle. The resin needs to be UV cured to achieve its properties. You probably have to cure it from the outside first, and then hang a powerfull UV diode through one of the ports and cure it from the inside too. Otherwise you retain a smeary surface on the inside, where expoxy won't adhere to. The last thing you want to end up with is epoxy and resin gunk in your cooler fins. And one more experience from bad judgement Drilling printed holes to final size often leads to scrap and frustration. The flutes from the drill tend to bite into the resin and crack the part, especially big ones (say > Ø6mm) Best thing is to print marginally under size and use a reamer instead of a drill. For bigger threads (like G1/4) the core hole can be printed directly. For small treads I always use brass inserts.