We propose a method to create 3D models by handling papers and a digital pen. First the user draws a cutting line on the paper sheet by digital pen. The shape of the paper sheet is captured, and shown on the PC screen with 3D image. Then the user specifies points to be connected with the paper, the 3D image relects the connection. Therefore, our method enables the user to generate a simple 3D model from his/her original papercraft. Since the paper-based interaction is common, we expect everyone who builds and papercraft can create their own 3D model.