50 teeth
thingiverse
Customized version of http://www.thingiverse.com/thing:16627 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=16627 Instructions Using the following options: retainer_ht set to 1.5 pulley_b_dia equals 20 motor_shaft is 5.2 additional_tooth_depth stays at zero profile selected is 2 no_of_nuts set to 1 nut_shaft_distance remains 1.2 m3_nut_depth reaches 2.7 retainer set to off m3_nut_hex now at one m3_dia is 3.2 additional_tooth_width increases by 0.2 idler turned off idler_ht still is 1.5 pulley_t_ht has grown to 12 nut_angle adjusts to 90 pulley_b_ht stretches to 8 teeth are a perfect count of 50
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