colosseum relief bookmark 3d model

3D printable bookmark, flat rectangular shape, portrait orientation, 6cm wide 20cm tall 3mm thick, shallow bas-relief of Colosseum front facade only, maximum 1mm relief depth, flat background, 2D engraving style, not a 3D sculpture, not a full model, arched windows detail, 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 objec