We lately began to manufacture for a robotic online vendor and managed to do few of the components for them. This is one of the Worm gear which took more time in processing, but finally managed to do.
Material we used is Delrin, which will make the component for longer duration. This Gear has designed by us in Solidworks along with the Spur Gear, so they will mate each other and tested manually by connecting to motors. Our Gears are suitable for 4 and 6 mm shaft hole diametres. There is also a screw for tightening the shaft rod.