Why a case for a folding phone is two cases
The constraint is not a design preference. It falls out of the shape of the object.
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How a case is made
A case for a folding phone is a precision part pretending to be an accessory. The mould has to hold a tolerance of a fraction of a millimetre, the two halves have to be made to match, and the print has to survive being bent around an edge. These pieces follow a case from the tool to the box.
