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Ok, I have the model almost completed, I'll probably add some cooling ribs and some little details, but it's almost completed. Really hope I can get it CNC milled soon. Was quite intense, creating the 3d model, I have almost no experience with CAD, but I learnt some cool stuff. The most time-consuming thing was measuring all the important lengths and distances of the original heatsink, I used a vernier caliper with an accuracy of 1/200mm, works fine but needs a lot of time and concentration. Here some pics:

Ok! I haven't got a r3 heatsink around, so I can't tweak the model for you, but I could send it to you if you want... unfortunately the differences between M15x and r3 heatsink are not negligible, so it's probably easier and faster to design it from scratch. I've seen some pics of the new 580m/6990m heatsink, seems they slapped some copper on it. I cut some "kind of cooling rips" in the model and a a little writing Maybe I'll redesign the cooling rips, but I don't think they're that essential, there's no air flow in this are, so it's more for enlarging the surface. Though I'm not an expert at thermodynamics, if anyone has some ideas, I'd be glad to hear them. Here two new renderings: