Customized version of http://www.thingiverse.com/thing:193647

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=193647

Using the following options:

facets = 6
drive_type = phillips
nut_thread_step = 0.5
slot_depth = 2
thread_length = 14
type = washer
step_shape_degrees = 45
outer_diameter = 8
thickness = 1
drive_diameter = 4
nut_resolution = 0.5
head_diameter = 6
nut_step_shape_degrees = 45
nut_diameter = 3
nut_height = 6
countersink = 2
thread_step = 0.5
head_height = 3
nut_type = normal
texture = exclude
nut_thread_outer_diameter = 6
non_thread_length = 0
non_thread_diameter = 0
resolution = 0.5
inner_diameter = 3.5
head_type = hex
wing_ratio = 1
thread_outer_diameter = 3
slot_width = 1