This is a slight modification to allow mounting atop the "supa flat" x-carriage from Aleph Objects. It needed a 60mm bolt spacing.
Slic3r will only generate the cone part of this object for extrusion width ratios over a certain value for some reason (2.77 in my case). The cone will clear the x-axis rods under the supa-flat carriage, but could be cut back some to improve air flow (the cone restricts air flow a lot). I removed most of the upper half near the end for better air flow.
The cone also hangs too low for my makergear groovemount setup. It needs a spacer under the bracket to raise it about 3mm. The spacer bar is to lift it up that much. Stacks of 3mm washers could be used too (6 of them make 3mm). This does get in the way of removing the big gear on my Wade's extruder, too.
Print the spacer bar, and the fan mount. Replace the front screws of the supa flat carriage bearing retainer with longer ones. Mount the spacer bar, then the bracket with washers and nuts on the longer screws (3mm x 25mm).
VERIFY before using it that the fan cone is higher than your extruder tip, or it will collide with your prints.