This publication relates a deformed hot-end tube of a liquefier of an FFF printing device. The hot-end tube is deformed to achieve an improved heat transfer to the core of the filament, and thus a faster melting of the filament which enables faster printing.
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Welling, Koos, "Deformed Hot-end Tube of a Liquefier", Technical Disclosure Commons, (February 21, 2022)