To combat my EZstruder's stepper motor heating and deforming the filament going into the bowden tube, I designed this Fan Mount for SeeMeCnc's Rostock Max V3. This mod has brought my Stepper Motor's temperature down about 18°C (see pics above). Since it also serves the entire top compartment of the Printer, it helps with the RAMBo and Pi boards I have in there. Note that the intake air is only as cool as the ambient air around your printer (the enclosure is next...).
The fan mount uses a standard 120 mm Computer case fan. I tricked mine out with a Thermaltake Ring fan. The mod mounts directly onto the existing injection-molded panel mounts with the same hardware for the melamine panels (melamine panel removed). Use 4mm hardware to mount the fan to the mount (the hex openings are 7.5 mm flat to flat). I also added a wire way for the fan wiring into the upper compartment of the printer (sexy-factor). Wired the 120 mm fan into the existing 40 mm fan connection on the RAMBo board. The only thing I might do in the future is get a dust filter for the fan intake. Enjoy...
You can choose to use the base model and have the slicer add supports, or use mine with 1mm wide supports.