Abstract: An interchangeable container for a system for building a mold body by forming superimposed layers of granular material, the granular material locally and selectively hardened layer by layer. The container includes a bottom structure that is displaceable in the interior of the container in a direction in parallel with the container side walls and at least one spindle drive having a vertical screw spindle rotatably mounted in a container side of the container, and a spindle screw nut on which the bottom structure is supported. The bottom structure can be lowered step by step in the interior of the container by the spindle drive.

Abstract: An interchangeable container (10) for a system for building a mold body by forming superimposed layers of granular material, the granular material locally and selectively hardened layer by layer, the container including a bottom structure (14) that is displaceable in the interior of the container in a direction in parallel with the container side walls, the container further including at least one spindle drive comprising a vertical screw spindle (20) which is rotatably mounted in a container side of the container (10), and a spindle screw nut (22) on which the bottom structure (14) is supported, such that the bottom structure can be lowered step by step in the interior of the container by means of the spindle drive.