Customized version of http://www.thingiverse.com/thing:165198

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=165198

Using the following options:

vent_2_strength = 54
ring_strength = 32
manual_distance = 39
diameter_2 = 57
diameter_1 = 57
distance_type = 1
vent_1_rotation = 45
vent_2_rotation = 45
vent_1_strength = 54
shape = 1