Thingiverse link: http://www.thingiverse.com/make:64808
Settings: MakerWare .3mm/low in a bit over an hour.
Technical notes: We used the following options in the Customizer for this model:
outer_r = 40UPDATE: This print spins easily and beautifully, but it is a little loose and some of the rings occasionally fall off. They are easy to put back on again, but I'd prefer a tighter model that this, so next time I'll lower the hoop_gap parameter.
hoop_thinkness = 3
hoop_height = 8
hoop_gap = 1
num_hoops = 6