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Large bubble during slump
Please help! I have never had trouble with this before. But the last two times I have fired a slump, using two different molds, I have ended up with a large bubble in the middle. Both molds have holes in them, and I always check, and they are not clogged. I'm using the pre-programmed slump, which has never been a problem before. Does anyone have any thoughts on why this would suddenly be happening to me. And do you think it's possible to refire, and fix the bubble, or do you think my project is doomed? :( Any input would be appreciated. Thanks!