I know nothing about the extension tanks, but do know ultem in some cases can be thinner than glass, so perhaps that can add some capacity? That's if there is not a chimney extension I guess. Was just looking at my prime and if the extension kit supplies a new tank section (again, no idea) could that have a chimney extension built into it? If so, that can accept a taller tank...just guessing hereThat doesn't explain how it's capacity magically changes from 2ml to 3.3ml.
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