40 mm fan spacer

This is a spacer to keep the fan blades away from the heatsink because blades close to heatsink is how sirenes are made. ;)
Found this idea on Thingiverse and couldn´t refind it later, so I made a remix using http://www.thingiverse.com/thing:157997. I simply removed the protection part.
I included a 3 mm and a 5 mm version. Simply place it between fan and heatsink. You might need longer screws!