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Beware, a crucible failure is always possible, especially when using tin cans (to say nothing about flowerpots), and in my case a crucible failure when taking the material ouside the stove was (more or less) likely to happen on the sand bed or into the stove itself. My stove would not suffer if it were splashed with molten alu. from the inside: I'd just collect it when cold into the bottom drawer.
I don't think my solid Oak floors would appreciate molten aluminium splashes
I can understand the increased satisfaction when people cast their own metal to make parts.