Customized version of http://www.thingiverse.com/thing:713300

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=713300

Using the following options:

nut_sides = 6
nut_width = 10
backlash = 0.1
knurled_density = 50
bottom_thickness = 0.6
knurled_height = 50
knurled_strong = 5
nut_thickness = 4
screw_hole_diameter = 55
height = 20
supportless_friendly = 1
diameter_2 = 125
diameter_1 = 150
screw_hole_length = 100
cross_section = 0