This is a hack off Owens cooler.
Added extra housing to cool all around printing object.
Seems to work good on my Ultimaker.
On request I can re-size for other build size of the fan.
I don't know the size of the original Ultimaker fan.
Print it as in STL file on its side.
Not an easy print to make because of the overhangs in the design.
But, even I can print it.
Stitch of fan 32 mm M3.