Make sure your printer is cooled down, powered off, and unplugged before working on it!
Unscrew your old heater block from the rest of the HotEnd body.
If you're working on a V6, make sure that the heat break stays screwed in to your heatsink (or screw it back in if it came out).
If you're having trouble unscrewing your heater block, you might want to heat up your HotEnd to loosen it a bit. BE VERY CAREFUL THAT YOU DON'T BURN YOURSELF.
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