This is a mount I designed quickly to an auxiliary cooling fan directed at the extruded plastic. I couldn't find a shroud with a hinged fan, so here we are. It is designed to fit a 40mm case fan, and be mounted to the wooden x-idler found on makerfarm pegasus series printers. This part is made with 'rough draft' quality dimensions, edit the part as necessary for your fasteners. Please post any improvements, hope this is useful.
Note: there is a nut trap for the hinge
Parts will need rotated 270 on the x-axis before slicing. Slic3r 1.2.9 resulted in some artifacts on the interior of the shroud without functional effect. Set print settings appropriate for material of choice with overhangs.