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I certainly know that i wont be using this type of cardboard again... Plus my intended slotting ideas didn't turn out the way i planned.. and if it wouldn't work with this mockup it certainly wont work for the X-board.
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This turned out the way i wanted it to be, but the side slots might have to be cut more diagonally in order for this to work with the X-board. Nevertheless it is really sturdy, and i was considering reducing the side slots just in case they were unnecessary.
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This one turned out the best compared to the rest. The weight distribution was good and it seemed pretty sturdy and strong. However this chair might take a lot of X-boards to produce... so i might have to reduce the side slices from 5 pieces to 3 pieces (or perhaps even 2 if it would be strong enough to hold somebody's weight). Might also increase the curvature of the base to add more rock to it.