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:

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