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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