I thought it was defective until I took the time to learn more about full metal hot ends and good prints. PTFE lined necks work best for my needs and I haven't had a single problem with them since replacing the thermal brake neck with one of the nylon lined replacements that came with the kit. All metal hot ends require much more severe heat brake cooling than I think and you need to lubricate the hot end with some oil and drastically reduce the draw distance or you will end up with a stuck hot end and neck like I did. A better extruder than mine would probably help too. If you've never typed with an all-metal hot end I'd still recommend getting one and trying it out, but don't be surprised if you don't. Get great results right away, as there's a learning curve here that doesn't necessarily have anything to do with the detail and build quality of this set. This hotend enters a treat after I used the parts provided to go back to a more beginner-friendly configuration.
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