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Hot tightening is essential to sealing the nozzle and heatsink together to ensure that molten plastic cannot leak out of the hotend in use. When done properly there is almost zero chance of leaks.
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▶ Video: Hot-Tighten the Hotend (5 min, narration)
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WARNING: YOU WILL BE HANDLING A 240*C HOT PIECE OF METAL. IF YOU'RE NOT CAREFUL, YOU WILL GET BURNED.
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Almost done!
Finish Line