The observed trend can be explained by the size variation (i.e.total area) of the blade types as well as the blade configuration and orientation of the blades (Fig. 2). Blade configuration #1 was composed of the largest blade (angled) only, with all of them directing the powder flow forward. This configuration conveyed more powder when compared to the other blade configurations. Blade configuration #2 was composed of the angled and flat blades, in an alternating sequence, with all of them directing the flow