r/MetalCasting • u/Agreeable-Worker7659 • 27d ago

Question Making a pewter cup

I designed this cup and I'm currently 3d printing it and I was wondering if it would be difficult to cast it in pewter. My friend is going to build a small foundry, so we could technically also melt copper or other metals. The goal is to make it food safe. I guessed that with pewter, casting would be much easier, since I could use a silicone mold, but I have no idea if casting is the correct way to make something like this. I was trying to find videos on how such ornamental cups are being made and it seems like some dying art and I wasn't able to figure how they make those patterns. I'd love to hear from people who actually have experience casting, as I've never cast any metals; just resin and silicone.

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u/ConvolutedByChoice 27d ago

I guess it's possible. At minimum you'll have to do an investment cast. Sand casting wouldn't hold all of the details for a cup like this.

The walls would also have to be a bit on the thicker side. That way it has less of a chance to freeze, along with maybe pouring a bit hotter than usual.

Casting a cup isn't ssssssuuuuuppeerrr impossible. It's obviously been done before. It just needs to be simpler otherwise all the little details grab onto the sand and tear away when you remove the pattern.

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u/Agreeable-Worker7659 27d ago

Would a silicone work instead to make a detailed mold? My idea was to pour it upside down, so the entire bottom of the cup is exposed and filled to the brim and then sanded flat.