This is something I started a long time ago in my own efforts to make my own silicone tail. Before drawing anything out, I wanted to make sure I would have all the tools to make it. Part of that was a scale mold that I could use over and over again without the fear of it wearing out over time. The only way I could think of was by using metal. I am not complete, but this picture shows what I have so far. The large one on the left is just over 2 1/2 inches wide and made of lead. I bought this lead from someone who melted a bunch of wheel weights and remelted it. The one in the middle is right at 2 inches wide and also made of lead. After spending some time with the belt sander to start smoothing them out before cutting lines with the Dremel, I changed my mind about using lead. Though I have the tools to work with it pretty easily, it is still toxic, so I am just putting those into storage. The scale mold on the right is made from aluminum. I melted a bunch of soda cans to get this amount. Although it is much lighter and not toxic, it has a higher melting point and more difficult to work with. The lead was able to pour into my custom sheet metal trays and take their shape. The aluminum started to cool too fast, so that is why it appears to have a rounded top. That's ok, I will put it on the belt sander and make a round scale as opposed to a cornered one as I saw in an article.
I will work with these more later. My current tools are insufficient for working with large amounts of molten aluminum as seen in this picture, but I have new ones on order. A word of wisdom: molten metal is dangerous. Do not attempt this unless you really know what you are doing.
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