Wind Spinner/Display Cage

This wind spinner was designed to fit things inside! Print your favorite 3D model inside the spinner, string it up, and watch it go! This decorative spinning cage will draw in people's attention and add a certain flair to a model that you wish to display. I recommend outdoor use; however, this spinner was designed to catch the wind from all angles, so feel free to place it in any room with sufficient ventilation.

Recent Updates:
2.2 - fixed orientation
2.1 - fixed a very obvious interference problem
2.0 - removed center column; added blades

More about the design:
As you can probably tell, this design is more than just a coil with a few rendering glitches. To define the the ribs of the cage, I used one 3D equation curve. This equation curve is set in spherical coordinates (r (radius), φ (azimuth angle), θ (polar angle)).
My equation curve is defined as follows:
r(t) = 50×(1+cos(t/4))/2×((8+1/2×sin(17*t)×cos(15×t))/8.5)^2
φ(t) = t/2
θ(t) = 12×t
† 0 < t < 360
† t