In this episode Ben shows how to use silicone to make reusable mold for casting concrete. This is an easy process for making a concrete copy of an existing object. I used Mold Star 30 silicone rubber ...

The fabrication method that Ron Culver and Joseph Sarafian have developed, of getting robotic arms to express 3D shapes for concrete casts, right now looks best for arts or perhaps furniture. But when ...