When this was designed, I wasn't great with TinkerCAD so the blades are not meant to spin. I have included a spare set of blades and a pin in case the first does not work out. I had an issue figuring out the weight of each piece, so they're each labeled as 1.
The spare_assemblyread_description.stl file is a spare set of fan blades and the cylinder that holds them in in case the originals fail. These are printed layed flat on the build plate.
The author hasn't provided the model origin yet.