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reassembly of the nozzle after unclog

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First check that there isn't any PLA in there that is preventing you from tightening it. If there is, try heating it up and remove as much as you can and then, while it's still hot, try tightening the parts together again.

If it isn't old PLA getting in the way then perhaps the brass tube has gotten screwed in a bit too far. Back it out a few turns, then screw on the nozzle tight and finally tighten the brass tube back up so that it connects with the nozzle. It should look like this when you're done:



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