This fan shroud fits SeeMeCNC's Rostock MAX 3D printer, for cooling workpieces as you print. It's built for a 4cm (40mm) fan. Supports are included as part of the model.
I felt like this printed better in PLA (after multiple prototypes), but materials are up to you. Support structures are part of the model, so just slice and print. Then pull the support off. It should remove quite easily. I drilled the screw holes out with a 7/64" drill bit to make sure the pilot holes were nice and smooth. Then I screwed the shroud to the rostock and the fan to the shroud.