This is a 120mm fan Housing and Blade Setup for DC Motors. The Bolt patterns match that of a 120mm PC fan. I Paired this it a 5v DC motor from an old CD-Rom, and it moves air really well.
Housing - 2mm Layer Height, 20% infill. You can increase infill for a more sturdy housing.
Blade - 2mm Layer Height, 10% infill. I try to keep the blade light for higher RPM's.
Any Simple DC Motor will be fine.