The feet on my box fan broke.  So I took some photos, imported them into Fusion 360, took a bunch of measurements with a micrometer and boom.  Replacement Feet on Demand.

After I printed the first one I realized it was a little loose so I made a minor adjustment (.25 mm to be exact) and it was too big.  I was a little confused.  Then I swapped the feet.  They both fit.  Then I measured the cutouts on the fans and found that one of them was just slightly smaller than the other.  Weird.  

In light of that, I am uploaded a “narrow gap” version in case the “normal gap” one is too wide.

I've also included models without the “claws” on the sides of the feet.  They feel like an unnecessary addition to the design.

Also, since the piece broke in the first place I printed with PETG and 25% infill.

Just in time for the “Replacement Parts” contest!