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:

additional_tooth_depth = 0
teeth = 32
motor_shaft = 5.2
m3_nut_flats = 5.7
retainer_ht = 3
pulley_b_ht = 8
pulley_t_ht = 8
m3_nut_hex = 2
nut_shaft_distance = 3
idler = 2
m3_nut_depth = 2.7
m3_dia = 3.2
additional_tooth_width = 0.2
pulley_b_dia = 55
nut_angle = 180
profile = 6
no_of_nuts = 2
retainer = 4
idler_ht = 2