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 = 3
arm_thickness = 2.4
number_of_arms = 3
arm_compression = 2.5
wall = 3
spool_diameter = 48
inner_diameter_backlash = 1
tube_diameter = 33.5
collar_thickness = 2
quality = 80
arm_end_diameter = 5
height = 10