Stefano made a robotic gripper, and wrote some details on round toothed gears.This is an openscad script that generates a round toothed gear with a round center hole, based on number of teeth and tooth diameter.Punch in your details, change the hole shape as required, print and use.The sample stl uploaded uses these values:tooth_diameter=3; tooth_number=13; gear_thickness=4; center_hole_diameter = 2;The rest is autogenerated.