I reviewed a hardened nozzle in this vid made by Performance 3d called the

3D Printing
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I reviewed a hardened nozzle in this vid made by Performance 3d called the Hercules for E3d Hot ends. Worth looking into.
http://www.youtube.com/watch?v=H_zI9SMKDVk

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I haven’t tried the Hercules yet, but Performance 3d makes good stuff.

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@Ryan_Carlyle I can’t speak for much else on their site, but very satisfied with the Hercules.