Inflatable is inherently leak proof. As for structurally resistant you have to consider that on the vacuum of the moon surface it will be pressurized (for human inhabitants); that makes it very stable. Maybe a better way would be to excavate a an underground cave and seal proof it with an inflatable liner.It should be much easier to excavate than 3D print it. You could use robots to do the excavation. Or look for some natural lunar cave. There are evidences that they do exist on the lunar surface
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Inflatable is inherently leak proof. As for structurally resistant you have to consider that on the vacuum of the moon surface it will be pressurized (for human inhabitants); that makes it very stable. Maybe a better way would be to excavate a an underground cave and seal proof it with an inflatable liner.It should be much easier to excavate than 3D print it. You could use robots to do the excavation. Or look for some natural lunar cave. There are evidences that they do exist on the lunar surface