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They are called Herringbone gears. They have the advantage of transferring power smoothly because more than two teeth will be in mesh at any moment in timehttps://en.wikipedia.org/wiki/Herringbone_gear
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I purchased mine from zoro.comhttps://www.zoro.com/search?q=&categoryl2=Inserts&...They are also named ultrasonic inserts.
Improving 3D Printed GearsView Instructable »