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:

wall = 3
inner_diameter_backlash = 1
number_of_arms = 5
spool_diameter = 51
arm_thickness = 2
quality = 80
chamfer_depth = 2
height = 19
tube_diameter = 27
arm_compression = 1
arm_end_diameter = 6
collar_thickness = 2