I do like the new socks for the hot end. Certainly it keeps everything looking a lot cleaner and permits more aggressive part cooling. One thing I do notice is that, over time, the sock begins to sag, no longer effectively gripping the top of the hot end. I wonder if anyone else has noticed and/or come up with a solution. At the price they are, I can happily just re-order more. Is sag just an indication that it's time to change, or a design flaw to induce repeat-purchase? Is there an actual degradation in the sock that means I really should change it. Has anyone created some sort of item to help apply pressure to keep the top of the socks over the top of the hot end. Could it just be that the hot end is dirty from previous-non-sock use and that small amount of crap is enough to cause sock droop?