This is for FlashForge Creator/PowerSpec Pro or early Replicators that have the two bolts in the lower holes of the fans and none in the top holes. It is a mashup between two great fan guards on Thingiverse. I combined the snap-on feature from TinmanTechnology to the Imperial Fan Guard design by johnbiehler. The model might not be perfect. There is only so much you can do in TinkerCAD.
Nothing crazy... .2 mm layer height and 20% infill using cheap Inland PLA at 203C. Bed is at 45C. I'm slowly ramping up my print speeds and I had this up to 125% the set speed of 60 mm/s. I slowed it back down near the tops of the snap-in pegs. Sailfish 7.7 is amazing for this sort of thing.