Feeding mechanism for 3D printer

The utility model relates to the technical field of 3D printing. The utility model discloses a feeding mechanism for a 3D printer. Including a base, one side of the upper end of the base is fixedly connected with a supporting plate. The side wall of the supporting plate is rotationally connected with a rotating rod through a bearing. The ends, away from the supporting plates, of the rotating rodsare fixedly connected with sleeves. Sliding rod grooves are formed in the ends, away from the rotating rods, of the sleeves; a sliding rod is slidably connected into the sliding rod groove. The end, away from the groove bottom of the sliding rod groove, of the sliding rod penetrates through a groove opening of the sliding rod groove and extends outwards, the end, close to the groove bottom of thesliding rod groove, of the sliding rod is conical, a plurality of push plate grooves are formed in the side wall of the sleeve in an annular array mode, push plates are slidably connected into the push plate grooves, and throu