That is a really interesting/weird effect. The bottom looks it almost moves in a sharp angle as those layers just bunch together. I've never seen that before. I too build my own all metal hotends. When I initially heard the knock I thought about the jamming that I experienced. I used vegetable oil inside the barrel and nozzle to stop the pla from sticking to the bare metal, and a fan to actively cool the exchanger, but the pattern that you show would seem to be a steps problem on one of the towers, if it is repeatable.
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