Customized version of http://www.thingiverse.com/thing:53916

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=53916

Using the following options:

isHypotrochoid = 0
Radius_of_fixed_ring = 32
Radius_of_rotating_ring = 4
baseThickness = 1
wallWidth = 0.8
height = 80
Segments = 300
Distance = 2
turns = 1
layerHeight = 2
twistCycles = 0.2