colosseum bookmark 3d model

3D printable bookmark, flat rectangular shape, portrait orientation, 6cm wide 20cm tall 3mm thick, Colosseum Rome raised bas-relief on upper half, front facade view, arched windows, detailed ancient Roman architecture, raised relief on front face, four letters S P Q R all four letters engraved vertically one above the other along the bottom half, no grid, no lattice, solid bottom half, bold serif Roman font, clean solid manifold mesh, no floating parts, thick walls, ready for FDM 3D printing, single unified object