I used X-board 'kraft'. I made 10mm square slits on the back side of side walls because these walls consist of not only vertical curvature but also horizontal one. I got good curvatures but they were not strong enough to support 150kg weight. If the squares are bigger, it could be stronger. I'll try to make some experimental models to know which size of square is strong to support weight and can make good curvature.
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