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Dual Extrusion Fan Duct for UltimakerThis is a dual head version of the annular fan duct designed by Maurits (http://www.thingiverse.com/thing:17768)
My first attempt, I think the second head might be a little bit off-center but I think it still works.
Version two provides additional clearance from the heater block and additional support for the fixing to the PEEK.
Note: This is a work in progress