Nema 23 Stepper Motor Fan Shroud / Mount

I wanted a simple fan shroud for the Nema 23 motors on my Taig milling machine. This design doesn't need any support and uses just 45 grams of filament. It does require four screws. I used 1/2 inch long #4 screws (about 2.5mm diameter, 10mm long). The fans are standard 40mm case fans.