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:

inner_diameter_backlash = 1
arm_compression = 1
tube_diameter = 10
arm_end_diameter = 5
arm_thickness = 2.4
chamfer_depth = 2
height = 10
quality = 80
spool_diameter = 32
collar_thickness = 2
number_of_arms = 3
wall = 3