What is the standard for charging mold modification fees?
Is there any charge for modifying the mold?
Whether there is a charge for mold modification is a question that many custom customers have in mind.
Why did the factory charge me for some minor changes? Are they trying to trick me into paying more?

The first one is that after communicating the product requirements with the factory, if the product does not meet the standards, the customer does not need to pay for the mold and can just ask the supplier to improve the mold.
The second is that after the product meets the requirements, the customer adds new changes to the product, such as adjusting the size of some areas. In this case, the cost of this change is the responsibility of the customer.
To sum up, it depends on whether you have adequate communication with the factory about the product in the early stage.