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In this video Paul Braddock covers how to Cold Cast a 3D Printed design. Printing, making a silicone mould from the print, doing the cold-casting with metal powder and resin, and then adding a patina and finishing.

Notable because the presenter and the materials are Australian.

This shows what cold casting is and this shows how it is done by casting up a copy of a cortana data chip replica from halo 4.

How to cold cast- this uses a polyurethane resin (but other resins will work too) and mixes it with metal powders. This technique is called cold casting, as it gives you the appearance of a metal cast piece but there was no melting involved, hence cold casting. This video shows the 4 main steps involved in cold casting which are:

Prepping the mold with metal powder casting into the mould with plastic weathering the cold cast piece polishing with steel wool

At the end of the process you have a cold cast piece that looks like real metal... because it has real metal in it!