Customized version of http://www.thingiverse.com/thing:615256

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=615256

Using the following options:

block_brand = lego
use_reinforcement = no
roadway_y = 0
roadway_x = 0
slope_stud_rows = 1
block_width = 1
block_type = brick
wing_base_length = 3
wing_end_width = 2
block_height_ratio = 1
curve_end_height = 0
wing_stud_notches = yes
curve_type = concave
block_length = 40
technic_holes = yes
wing_type = full
roadway_width = 0
vertical_axle_holes = no
dual_sided = no
stud_rescale = 1
slope_end_height = 0
stud_type = solid
roadway_length = 0
dual_bottom = no
curve_stud_rows = 5