Of One-Part, Two-Part Molds and More

As an art teacher, I am often faced with confused students who just don’t know when to make single part molds and when two or more part molds are required.
Let me clarify this uncertainty for everyone out there as well.
A one-part mold is basically a simple mold. It is used for making molds of figurines, small statues and other uncomplicated objects. Needless to say, this kind of mold is easy to make. All you have to do is fix the model to a mold box and pour or apply the mold making material all over and around it.
As the model has to be glued down in the mold box, it goes without saying that it should have at least one flat surface. It should be entirely level without any undercuts or any kind.
It follows that a shapely model with uneven surfaces and deep undercuts needs to be reproduced in parts. What it needs is a two-part or even a multi-part mold to capture all the details on all the sides. This is a complex technique that requires a lot of care and practice to master the various requirements. Parting lines, mold keys and spues also come into play here.
In sum, two part molds become requisite when a model has to be reproduced in its entirety on all sides on account of the undercuts and other details everywhere.


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