Photographic studio background Free 3D print model

Free standing display holders for photographic backgrounds. Ideally designed for A3 sheets, but will take larger. The background sheet is held in the deep channels of a left and right stand. Although the stands have a flat base to stay in position, I have incorporated a feature that allows them to fit on 5mm foamboard (or anything else at 5mm thick). When fitted onto a length of foamboard, the two stands are held in position and more permanently fixed.No support is necessary for printing and I suggest normal setting with 20% infill.