DEVICE AND METHOD FOR CHANGING FILAMENTS OF DIFFERENT COLOUR AND/OR DIFFERENT MATERIALS FOR THE PRODUCTION OF 3D PRINTED PARTS AND EXTRUDER WITH FILAMENT CHANGING SYSTEM

摘要

The invention relates to a filament changing system (1) and a method for changing filaments (20) of different color and / or different material for the production of 3D printing parts by the FLM method, wherein between a storage device (4) for all filament strands used (20) and an extruder (3) at least one selection means (6) for selecting the respective filament to be used (20) and at least one separation unit (9) for separating the previously used filament (20) are arranged, and that each of the usable filaments (20) each associated with a switching device (15) which can bring the associated filament (15) either in conveying position for conveying by a drive unit (14) at a defined speed or release so that the filament (20) unhindered, preferably by means the extruder (3) can be conveyed, wherein the selection device (6) has an allocation device (38, 32), the fü for the filament (20) used in each case forms a section of the conveying path from the storage device (4) to the extruder (3), and the switching device (15) and drive unit (14) are at least temporarily adjustable so that the newly used filament (20) with a higher conveying speed than the conveying speed of the previously used filament (20) the previously used filament (20) is conveyed afterwards.