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@simonw7
doesn't that kind of defeat the object of a vacuum flask? - i.e. that it keeps things hot for a v long time? People would probably prefer to spend a bit more money to get a decent quality vacuum flask (that works) then to buy a shit one which they need to reheat their beverage of choice in because the flask did not work.
tip - you could save money on your design by just having any old container which can heat your stuff rather than fannying around trying to needlessly incorporate a vacuum flask in complete contradiction to the intended functionality of the final product.