I printed FifthOrb's remix of ThruTheFrame's Aux Fan Saver. When I tried to install it, it would not sit flush with the fan (see photo). Out of sight I found my fan has two screw tabs that blocked the support. I added (removed) two sections to allow for the tabs. Reprinted and now sits perfect.
Check your fan first if it has the tabs like mine or not so you don't print the wrong support. Thanks to both ThruTheFrame and FifthOrb for their contribution.
The author remixed this model.