This is a remake of http://www.thingiverse.com/thing:547706 but is adopted for the Qubd printers, as well as a shortened design. I have created an extended design so the fan can be put behind the extruder to open both sides up for additional fans. I have also added a Z-Probe mount, it will need support to print as well as a 240 degree rotation in most cases.
To clamp this unit together, you'll need 2 x M4 screws with 20mm length and 2 x M4 nuts.
4 x M3 screws and nuts are used to attach to the main base.
Added fan bracket that was created. I think the bolts used were M3, the fan bracket was solely designed for the use with a 40mm x 40mm duct fan as shown in pictures.