3DPS: 3D Printing Signature for Authentication Based on Equipment Distortion Model

To counter the counterfeit of 3D printed products, 3DPS, an improved printing signature for 3D printed objects based on our previous work is proposed for authentication. A specific hole is added to the non-critical flat portion of the 3D printed object, and the 3DPS is constructed from the contour of the hole with a hand-held microscope. Compared to the previous work, the equipment distortion model and the 3DPS’s construction are improved, and the threshold can be calculated directly rather than determined by experience. Experimental results show that the 3DPS not only can effectively authenticate 3D printed objects with high accuracy but is also robust and secure.