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I have been working on a project that is without doubt my best work thus far (no spoilers yet!) but ran into a snag with casting the fittings. I already carved the wax, made a silicon mold of it and a few copies. That all went fine, and actually came out better than expected. However, after setting it in investment, the bronze well, failed miserably. I had a small sprue vent to help the air escape, and that filled about half way before a void the size of the thing I was casting formed between it and the top of the flask. Is this because the bronze was too cold? Or the mold not preheated enough? Any advice would be greatly appreciated. Hopefully, I'll be able to give it another go this afternoon. Thanks John (Large cone part was the top of the mold, thin wiry thing the vent, and the bit on the end of it being the bottom part of what I was trying to cast)