Customized version of http://www.thingiverse.com/thing:290804

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=290804

Using the following options:

cutout_count = 30
cutout_tilt = 0
height = 16
ruffle_width = 4
inner_cutout_shape = 3
outer_cutout_inset = -0.25
surface_type = 1
passage_width = 0
outer_cutout_shape = 32
inner_diameter = 47
inner_cutout_radius = 2
outer_cutout_radius = 1.25