The hand made glass is normally using the hand mold to shape the glass from the heated glass liquid. The hand mold is easily get worse and scrapped by producing around 50,000 pieces of products. So it wastes a lot.
The environment of the hand mold work shop is mostly dirty and messy,plus some technical limits for the productions, it is hard to keep the products clean or ensure the products’ quality.
That is why many customers do not like the hand mold products. And the manufacturers also feel difficult when the order quantity is too big.