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_tilt = 0
ruffle_width = 20
surface_type = 0
inner_cutout_radius = 2.25
outer_cutout_shape = 32
outer_cutout_inset = 1.25
inner_cutout_shape = 5
inner_diameter = 56
cutout_count = 32
height = 12
outer_cutout_radius = 1.5
passage_width = 1.25