About this 3D model

My first attempt at a vortex diode just kind of worked:http://www.thingiverse.com/thing:96480 But I wanted better. So I more than doubled the radius. Properties:blowing in one direction is harder than the other. You can find out more at my blog: http://mymakerblog.wordpress.com/2013/05/31/fluidic-diodetrials-and-tribulations/