[Neil] and [Austin] had the idea of using acetone vapor, created in a glass jar placed on top of a heated build plate, The process is pretty simple. Get a large glass jar, put it on a heated ...

As the vapor touches the surface, it cools the penny down and as it burns, it reheats the penny. The convection of air around the penny may also contribute to this effect. Pour 5mm of acetone in a ...