I added a casing to a radial fan posted a while ago. I 3D printed the case and laser cut in acrylic the back and front covers just to make it more fancy but theres no reason why not to print all.
- Print the fan and the case.
- Adjust the back cover to our motor (mine is a DC with 20mm bevel at the shaft)
- cut the back and front cover in 1mm acrylic.