I had some pretty bad clogging that an atomic-pull didn’t seem to help.  This means I had to take the hot end apart and clean it all out.  I thought I’d post some photos for those that wonder whats in the stock hot-end.  Disassembly was pretty easy; heat it up and hold the heater block with a crescent wrench and use socket wrench on the nozzle.  The barrel came out without much fuss and I was glad to see the embedded PTFE had no damage.

Cleaning wasn’t too bad.  I spent some time with a toothpick dipped in acetone to clean out as much as I could from the threads.  At first I thought something was wrong when I saw the black on the threads but it appears from Googling around that all hot-ends look like this.

To completely clean out the excess PLA from the nozzle I took a torch to it and got it just under cherry-hot.  After that, another bath in acetone.  I used coffee filters to wipe everything down as that seems to not leave any residue behind.

Cleaning the block itself was done by heating it up and running the coffee filter through it, screwing it in and out several times until it stopped coming out black.