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:

diameter_2 = 125
diameter_1 = 150
nut_width = 11
screw_hole_diameter = 55
nut_thickness = 4
cross_section = 0
knurled_height = 100
supportless_friendly = 1
backlash = 0.1
height = 8
knurled_strong = 9
knurled_density = 40
nut_sides = 6
bottom_thickness = 0.6
screw_hole_length = 100