Buffer, 3D printer, control method and device of 3D printer and storage medium

The invention discloses a buffer, a 3D printer, a control method and device of the 3D printer and a storage medium, the buffer is applied to the 3D printer and provides a buffer space for consumable extrusion of an extruder, the buffer comprises a fixing plate and a storage container which are correspondingly arranged, a first assembly is arranged on the fixing plate, and a second assembly is arranged on the storage container; the first component is a sensing piece, and the second component is a sensed piece, or the first component is a sensed piece, and the second component is a sensing piece; wherein in the initial state of the buffer, in the detection range of the inducted piece and in the moving process of the consumables in the buffer, the second assembly is used for moving in the direction away from the first assembly of the feeding port along with the movement of the storage container; the sensing part is connected with a controller of the 3D printer, and the controller is used for controlling the feed