Customized version of http://www.thingiverse.com/thing:735213

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=735213

Using the following options:

arm_end_diameter = 5
number_of_arms = 3
inner_diameter_backlash = 2
arm_compression = 1
height = 64
arm_thickness = 2
spool_diameter = 55
quality = 80
chamfer_depth = 3
wall = 3
collar_thickness = 2
tube_diameter = 33.5