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I've attached the Parasolid models to this reply - One of the files has the E3D hotend, nozzle and blower (from the Bear files) for a positional double check, the other is the Parasolid of the duct only. Last file is the internal structures trimmed off at the exits. Both NX and Rhino tell me they are solid bodies. Hopefully they will be simpler to work with. Thanks for doing this :)
P.S. Happy New Year