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I do play guitar, but I had to buy a string for printer maintenance. It's now on a shelf above my hobby bench--right next to the iron.

For a .4mm nozzle, you'll want a .010"-.014" guitar string. Larger ones won't fit.

None of the strings this small are wound, so that isn't an issue.

I've seen it done (YouTube) with a blowtorch and rubbing alcohol. The video ended with an accidental fire, though...

I have wondered if the melted plastic in the threads might act as a lubricant. In my case, I disassembled everything, soaked it in acetone and cleaned the threads, inside and out before...

I'm printing ABS at 250C at around 100mm/s.

The Hexagon, like other all-metal hot ends tends to loosen when heated, because the aluminum block expands more than the stainless tube. Colin shows in his video how to tighten the hot end, but you...