[lukejagg]

That's an interesting idea, would be interesting to see how well it can follow the rules for creating insulation. I think one limitation would be that it is simply following predefined rules for neighboring cells, which would mean it might not produce the mathematically best result given just the neighboring cells.

Of course, it would be interesting to see all of these iterative growths from a simple set of rules.

[samstave]

You print the pattern on the NORMAL to the curved surface building up the cell walls... then top off with a skin.

You can modulate fillings of cells too - imagine cells being filled with anti incendiary fire retardants

or chemically induced reactionary ( so if [CHEMICAL] touches that cell, due to some sort of breach, the cell super absorbs and expands to capture that chemical...