Waste material discharge device for 3d printer and 3d printer

A waste material discharge device for a 3D printer, comprising:

• a material bin, wherein the material bin comprises a material inlet, a cavity and a material outlet;
• the material inlet, the cavity, and the material outlet are sequentially communicated to form a material discharge channel, the material inlet is configured for entry of waste materials of the 3D printer, and the material outlet is configured to communicate with an outside of the 3D printer to enable the waste materials to be discharged to the outside of the 3D printer along the material discharge channel;
• a trigger connecting rod arranged at the material inlet and pivotably around a first rotating shaft, the trigger connecting rod comprising a first end extending out of the material inlet;
• and
• a material blocking plate pivotably around a second rotating shaft;
• wherein when the first end of the trigger connecting rod is located at a preset position under force of a printing head of the 3D printer, both the trigger connecting rod and the material blocking plate are configured to be activated, and the material blocking plate is configured to block the waste materials from entering into the cavity.