The primary distinction is that PTFE is positioned far from the hot zone, which over time can lead to wear and potential leaks. This is particularly crucial when printing with higher temperature materials, as PTFE has limited temperature resistance.
Additionally, for all-metal hotends, it’s essential to ensure that the nozzle and heat break are hot tightened. This helps prevent leaks caused by thermal expansion.
Image Source: https://recreus.com/gb/noticias/learn-with-recreus/filaflex-vs-all-metal-hotends
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