Three-color wire extruder device for 3D printer and control method

The invention relates to the field of 3D printers, in particular to a three-color wire extruder device for a 3D printer and a control method. The three-color wire extruder device comprises an extruding box, a controller, a filtering mechanism and a printing head, wherein an L-shaped supporting plate is fixedly arranged at the bottom of the extruding box; the extruding box comprises a box body, three driving mechanisms, driven wheels and driving wheels; each driving wheel is fixedly arranged at the bottom of the inner side of the box body through a fixing seat; the three driven wheels can be rotationally arranged on the box body through one driven shaft; limiting rings are fixedly arranged on two sides of each driven shaft; each driven shaft is attached to a driving roller through an elastic mechanism; and the box body is provided with a penetrating hole for a printing line to penetrate through. According to the three-color wire extruder device for the 3D printer and the control method,the occupied area of the