Abstract: This disclosure concerns use of additive manufacturing, such as 3D printing, in construction. Specifically, this disclosure concerns manufacturing of building elements using 3D printing. A method for manufacturing concrete elements for construction of buildings is also provided wherein concrete elements comprise regions of a concrete material and regions of a filler material. The disclosed method comprises at least the steps of forming a mold by printing mold walls, the mold walls delimiting a plurality of regions in the mold, pouring one of the concrete and filler materials in at least one of the regions in the mold, leaving at least one other region empty, removing at least a part of the mold walls, and pouring the other of the concrete and filler materials in at least one empty region.