My fan stopped proper functional since thins part broken, so i decided to design this one with stronger walls.
It's easy to print. Not required too speacial skills.
To make this part even stronger i printed it at very low layer height. Also instead of 0.4 line width in slicer i changed it to 0.39.
If you really need original design to edit this one, you have to have Solidworks or any other CAD which supports .STEP file. Feel free to remix that one!

upd: added step and sldprt files