Customized version of http://www.thingiverse.com/thing:488993

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=488993

Using the following options:

twistangleout = -60
dgroove = 3
ringshape = dents
gcd = 1
cutoff = 0
bevelsun = yes
npolygon = 6
bevelring = yes
0sunholeshape = doublecut
dsunhole = 6.4
earing = 0
htot = 8
asunoffset = 0
twistangle = 45
bevelplanets = no
twall = 2
mplanet = 4
eaplanet = 0
clr = 0.3
dplanethole = 3
eplanet = 0
nringgrooves = 12
cutoff45 = yes
info2 = error modes
info1 = Note the tab bar above!
eaxle = 0
dbase = 1
eaaxle = 0
nadd = 4
nsungrooves = 3
msun = 6
$fs = 0.25
$fa = 5
ering = 0
dsungroove = 3.4
bevelringoutward = yes
eps = 0.05