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:

pulley_t_ht = 6.5
profile = 5
m3_nut_hex = 2
m3_dia = 2.5
additional_tooth_width = .3
pulley_b_dia = 25
retainer = 3
pulley_b_ht = 8
nut_angle = 90
additional_tooth_depth = 1.5
no_of_nuts = 4
nut_shaft_distance = 1
idler_ht = 0
motor_shaft = 4
retainer_ht = 3
m3_nut_depth = 3
teeth = 22
m3_nut_flats = 3
idler = 3