Gears really do not like burrs, so after gear cutting, burrs must be removed. Here is one example of the many ways to deburr a gear. This process uses 2 hob cutting tools. Each cuts and feeds in an opposite direction, thus removing burrs. This process can be used on plastic or metal gears.
Explore Hera hobbing and deburring.
The Hera 30 supports two-hob gear deburring for burr-free hobbing on plastic and metal gears.