Grinder assembly is exactly one as could be found in many cheap grinders as ascaso i-mini for example. There is two types of grinding chamber the cheaper one that made of plastic and more expansive that made of aluminum. This one is plastic.
The problem with this grinder is that it has plastic ears that carrying worm gear and they are flexible. Grind setting is constantly floating during grinding, produce poor quality grind.

My grinder ended up with unclear motor stalls and was not able to produce fines for espresso at all.