Bánh răng chổi Kyvol E20 (kyvol E20 Brush Gear)

My Kyvol E20 decided to "eat" a cable, destroying the main brush gear, so it was no longer spinning. I tried a model from a friend here, but that always breaks as the top part walls aren't connected, so I reduced the main brush head size to about 5.90mm, created a new model on TinkerCad, adjusted the top part of the model to have 5.95mm of size (square part) and voila, it fits perfectly, the main brush head has a strong connection now and my robot is cleaning again. :)