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I was having the exact same issue. Manually pushing filament through the hot end at high temps aka 250 and it was near impossible to push. I ended up replacing the entire hot end and it solved the issue. Best I could figure was the heat break was damaged from either the bluprint material i used ...

I've started to have the same issue and best I have been able to tell it is something with the heat break in the hot end. I think I let it get too hot or tightened it too tight. From what I figured out after tearing it down several times is that the melt is happening too high up in the heat break ...

Has anyone else done this yet and if so could you give me a hint of what is involved. I have the new hot end already and attempted to install into the stock configuration which did not work out very well. Any hints tips or instructions would be greatly appreciated. I seriously can't be the first to ...