The only way you would be able to print one at a time is by "stacking" them (one on top of the other). But then, there would be a lot of support involved and it's not the ideal way of printing. It is "do-able" but not practical.
Most 3D printers work using "Layer by Layer" building.
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nallath 1,124
In order to keep things simple (implementation wise) we simply don't account for this situation.
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