To create the silicone mould, I needed to use my clay model from last project. I set the model in soft, water based clay and glued a foam-core box around it. To make enough space between the edge of the mould and the space where the resin would take shape, I had to leave about an inch and a half of clay. I also poked holes in the clay that would later be filled in by the silicone. These would help the silicone mould stay together while the resin cured.