Reading about this, just makes me wish I has good 3d scan of their impellers to see how a simple 3d printer will deal with such mythical precision.
The blades of the fans are fiber-reinforced, in order to have sufficient rigidity, even when very thin.
Only a 3D printer for metals could print something rigid enough, but such a metallic fan would be too heavy for a computer fan.
> To protect our intellectual property, certain features – such as fan impeller geometries – have been slightly modified while remaining visually very close to the actual product.
So you do have to 3d scan them yourself if you're trying to print a copy.
You want dimples to create turbulent air that stays attached for longer, this INCREASES skin friction but since the golf ball is a bluff body it's friction losses are dominated by form drag, not skin friction. Putting dimples on a wing will drastically lower it's lift to drag ratio (which could in some cases be desirable, but it will absolutely not make the wing more efficient).
Of course all of this is moot anyway because the dimples need to be tuned to the Reynolds number you're expecting to operate at. Random surface imperfection wouldn't help even if it could help, which it can't.