This fan duct will send the electronics cooling air away from the heated print bed and eventually out through the side of an enclosure. The mounting screw holes are all placed relative to the corners of the base. You might need to adjust those for your needs. In OpenSCAD, the CSG (F5) processing isn't useful because of the intersections (If I Understand Correctly). The piece prints in ABS without support material (suprisingly). There's a little bit of awkwardness at the very peak of the output circle, but it's solid enough for my purposes. There's a conical support pillar for that, turned on with an assignment in the openscad.