Abstract: A material system for use in a 3D-printing, which exhibits a higher form stability. The material system contains binder and solvent as well as optional filler materials. The binder is soluble in the solvent, as well as two complementary polyelectrolytes, and/or an initiator for a cross linking reaction of the binder. The advantage of such a mixed material system is comprised in the essentially higher binder force between the individual particles. This enhanced binder force results either from the acid-base linkages, which form between the complementary polyelectrolytes, or from the supplemental networking initiated by the initiators, or from both. Substantially higher binding forces between the individual particles means at the same time a substantially higher shape stability of the 3D-printing product.

Abstract: In order to achieve the situation where a pivotably mounted structural part, under the action of an adjusting force, is made to move indeed automatically but merely with braking and damping action, and thus at a reduced speed and with reduced kinetic energy, provision is made for the hinge which mounts the structural part to be equipped with a pivot brake, of which the braking force applied over the pivoting distance is smaller than the adjusting force and is adapted to the progression of the adjusting force over the pivoting distance. In selected regions, the braking force of the pivot brake may be greater than the adjusting force, in order to retain the structural part in these regions. The braking work performed by the pivot brake is advantageously calculated so as to absorb 20% to 25% of the adjusting work performed by the adjusting force.