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:

height = 10
passage_width = 3
cutout_count = 21
cutout_tilt = 0
surface_type = 1
inner_diameter = 52
outer_cutout_shape = 32
ruffle_width = 35
inner_cutout_radius = 2.25
outer_cutout_inset = 1.25
inner_cutout_shape = 32
outer_cutout_radius = 1.5