Timeline photos "Composite molds are typically CNC machined, an…

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"Composite molds are typically CNC machined, an industrial process which very few people have access to. 3D printing is all about accessibility, so our hope is that if we can 3D print our molds on a simple, single-extruder printer then it will make the process more accessible to the homegamer.
Scaffold has the capability of being used as a soluble mold for plastic, allowing the creation of create complex part geometries in a single layup that would be very difficult to achieve any other way.
In addition there’s the possibility of using multi-material prints with Scaffold to make composite parts that also have embedded functional components or even mechanisms."

https://e3d-online.com/blog/2017/03/03/scaffold-moulding/