Comment on A d20 I painted as a present. by NonCharon

It's based upon a mathematical model. I'm sure that uneven distribution of weight due "20" having more metal than "1" (as an example)might lead to some variation. That being said, I don't know that it would be worse than normal dice that are tumble polished that leads to subtle imbalance and uneven edges. As far as I know only Gamescience dice (with sharp edges) are not imbalanced in some way.