Roombas aren't going away if the rise and fall of an interplanetary empire happened while they're still going strong. This species of household appliance was redesigned to capture and kill verminous creatures, which aren't rare in ecumenopolitan ruins. Wild roombas are actually a bit of a pest themselves since they breed on their own and potentially steal knick-knacks from settlements. They are otherwise harmless on their own, and basically free grade-s nanotechne because of this.
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