ModCraft 3D › Open Book Template 3D STL for CNC Image 1 of 3 Image 2 of 3 Image 3 of 3 Open Book Template 3D STL for CNC $15.00 Open Book Template is a digital file for CNC and 3D printing in STL format. Purchase Added! Open Book Template is a digital file for CNC and 3D printing in STL format.