It is also possible to 3D print a pattern (from which to cast a metal part) in wax. This is then used in a lost wax casting process where a ceramic coating is used to cover the wax which is then melted out and the metal poured in. No 'draw' or loose cores required and almost any shape is possible with hardly any more effort. 3D printing in wax is about the lowest tech form of 3D printing as temperatures and pressures are obviously much lower than in PVC and in a different world to 3D printing in any metal.
David
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