To make the square die can take to concentration of heat in the corners. That is something that I don't believe it happens in the core. I think that a circle of 100mm.2 is more representative of the heat of the core, since the concentration in the superior edge would be almost same and there would not be concentration in the corners. I am to build one and a lot I would like to be able to arrive to a definition with regard to the dimensions. Pardon for my horrible English.
