The 24 volt Revo Six kit 0.4mm is a direct replacement for your E3D V6 hotend. This allows you to easily get all the benefits of E3D's RapidChange Revo ecosystem in one package. This model has the same height and diameter as the E3D V6 setup, allowing it to attach directly to your existing installation. All you need to do is plug in the Revo HeaterCore.
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E3D Rapidchange Revo nozzles are easy to change at room temperature, without using extra tools.