Abstract: A device for mixing viscous liquids, comprising a cylindrical mixing chamber (100) that is open on one front and has a side wall, at least two injection nozzles (170), the nozzle openings of which are provided with exit bores (105B) in the side wall, and a piston (150) that can be displaced inside the mixing chamber (100) in axial direction, along the longitudinal axis (A-A) of the mixing chamber (100) and which has a circular surface. A motor (135) (FIG. 1) can move the piston in axial direction as well as rotate it around its longitudinal axis inside the mixing chamber (100).

Abstract: With a model for creating a prototype (rapid prototyping), two components (A, B) are mixed inside a mixer (12) of a traversing application head and the resulting model-building mass is ejected from the nozzle (14) of the application head. As a result, the prototype is constructed in layers. The two components react with each other and increase in volume, so that the layers of the prototype can be relatively large, approximately 1-5 cm (FIG. 1).