Customized version of http://www.thingiverse.com/thing:1339

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=1339

Using the following options:

starWidth = 2
addendum = .5
orientation = -1
circleDiam = 0
toothWidth = 1.1
extrudeOutWidth = 9
shaftDiam = 6
romeDed = 2
dedendum = 1
gearHeight = 11
circleNum = 0
starNum = 6
centerShape = 3
pitchDiam = 39
romeAdd = 2
doubleHelical = 0
rome = 0
teethNum = 45
extrudeOutHeight = 3
romeToothWidth = 2
romeAngle = 5
extrudeInHeight = 3
extrudeOut = 1
angle = -15
extrudeIn = 1