No you do make a good point, and that area of the block design is technically a poor show on my part ....... hang on I'll smack myself about a bit
The real truth I suppose is I just lost patience with all the milling and snapping milling bits at the time.
The other thing is that cooler is designed for my set-up so will have sub ambient coolant, (12C to 14C), so assuming the flow is reasonable it should be fine. As you say it might be a good idea to try to percentage the flow more in favour of the frontside block. The main thing in making it was simply to test a concept, and I'd be the first to admit needs development. It would certainly be much easier to make on a proper CNC machine. My goal in all this is to come up with the best single unit block to cool the complete card, with one inflow, one outflow, while being a single slot solution.
The only thing I'm still finding hard to solve is the weight factor using all copper designs, but this is always going to be hard. I still rather avoid plastics if possible for the usual reasons.
*EDIT* Channel depth is > <4.2mm, best I can check now......... did have it written down somewhere :shrug: