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Different cooling rates lead to the formation of depressions at the connection surface, which is known as the contraction mark.
There may be one or more reasons for the formation of shrink marks. The choice of geometry and material is usually determined by the raw material supplier and is not easily changed. However, there are many factors on the mold design that may affect shrinkage.
The simple solution is to modify the conventional core hole, but it is impossible for you to apply it to all resins. In addition, gas-assisted methods are also worth a try.
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