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:

chamfer_depth = 2
number_of_arms = 6
arm_thickness = 2
arm_compression = 0.8
wall = 3
spool_diameter = 32
inner_diameter_backlash = 1
tube_diameter = 0
arm_end_diameter = 3
collar_thickness = 1.5
quality = 100
height = 10