Following the precedent design shared here: https://www.youmagine.com/designs/35x35-12vdc-um2-family-centrifugal-fan-shroud
Print with the PLA or the medium heat resistant material of your choice
0.1mm layers & 0.4 nozzle recommanded
centrifugal fans sourcing :
http://www.mouser.fr/Search/ProductDetail.aspx?qs=%2fW4LtXOBxKsfL3eA88psUg%3d%3d
metal sheet cut from any beverage can of your choice
metal sheet forming process description