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The application relates to the field of 3D printing technology, in particular to a 3D printing device which comprises a base, a frame arranged on the base, a workbench arranged on the frame, a three-dimensional movement mechanism arranged on the frame, a driving mechanism arranged on the frame and a transmission mechanism arranged on the frame and connected with the three-dimensional movement mechanism and the driving mechanism. The transmission mechanism can buffer the impact through a conveying belt, so that the influence of the impact is slowed down, and the normal operation of the mechanical equipment is protected.