Customized version of http://www.thingiverse.com/thing:16627

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=16627

Using the following options:

m3_nut_hex = 0
idler_ht = 1.5
retainer_ht = 1.5
profile = 6
m3_nut_flats = 0
no_of_nuts =
retainer = 1
m3_nut_depth = 0
teeth = 20
pulley_t_ht = 6
m3_dia = 0
pulley_b_dia = 10
nut_angle =
additional_tooth_depth = 0
pulley_b_ht = 0
idler = 1
motor_shaft = 5
nut_shaft_distance =
additional_tooth_width = 0.2