GAME OVER For Hotend/Extruder Design? - The Biqu H2 Direct Drive Hemera Alternative

Direct drive extruders make superior quality 3D prints, but you pay a major price for that quality. They are slow! By reducing the weight you can speed up the printing. This hotend and extruder combination (The Biqu H2) is the lightest such design out there which is also 100% metal construction. Therefore you can put it in an enclosure and it will stay dimensionally stable. So what's the catch? What's wrong with it?

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