Voron afterburner Warbird Part cooling duct for E3d Volcano

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A modified version of [Greg191134's](https://github.com/Greg191134) [Warbird](https://github.com/Greg191134/Voron/tree/master/Afterburner%20Optimisation/The%20Warbird) part cooling fan duct for Voron Afterburner Extruder and E3d Volcano hotend. There is a stretched V6 fan duct for volcano out there, but it blows too much air to the heating block, cause a lot of false thermal run away, so I sliced and reattached the Warbird duct for more directional flow. I extended the air nozzle down 8.7mm for the difference between volcano and v6, then narrowed the gap between nozzle and hotend for more directional flow, note that it is not symmetrical anymore, heat block should mount at the angel when both sides have same clearances. If you decide to use this duct you also need the matching cooling fan cover, which is included in the stl file list, or you can download it from [Gred's github repo](https://github.com/Greg191134/Voron/tree/master/Afterburner%20Optimisation/The%20Warbird) and learn more design detail there too. All credit goes to [Greg191134's](https://github.com/Greg191134)