I printed mine too and ordered the same heatsink. I had to play with sandpaper for an hour to make it fit haha. The guy at the 3D print shop printed it in a stronger less flexible material, probably that also contributed. So if anyone wants to avoid it, you can add some little support legs for the heatsink itself and make the opening a few mms bigger.
I think it definitely works, as I just mounted it a few minutes ago and it’s already a bit warm.
