Econit is a novel sustainable material system at the intersection of additive manufacturing and building construction. As a base material, econit can bind various aggregates, even in large quantities. Our aggregate of choice for econit Air is recycled and expanded glass granulates. For this material, we use glass that cannot be used for the production of bottles anymore, as it has exceeded its lifespan. We use these leftovers and fill them with our to produce a very lightweight, yet stury construction material with excellent insulation properties.