Neville is referring to a 3D printer that "prints" food, drinks, clothing,spare parts, even body organs. It works by building up molecular lattices holographically, one layer at a time, converting energy to matter as it does so. The one aboard their ship can print up a small car, with gas in about six minutes!

Immortals are rare and only certain genetic patterns are strong enough to even have a chance of surviving the 1000 day ordeal!