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_width = 11
nut_sides = 6
backlash = 0.1
knurled_density = 75
bottom_thickness = 1.5
knurled_strong = 2
nut_thickness = 18.5
knurled_height = 70
screw_hole_diameter = 55
height = 20
supportless_friendly = 1
diameter_2 = 112
diameter_1 = 125
screw_hole_length = 33
cross_section = 0