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How about doing a rotating door. have it rotate along the long axes at the middle of the door have two actuators with wire wrapped around a pulley. when one is out the other is in. Then it will pulling open or shut. when open it would be parallel to the ground.
Would that work?
If I stay with the slats, if I make two sliding doors stack on each other, I could have each open 1" for a total open of 2" for each 1" of blocked off space. That would give me all closed, 1/2 open or 2/3 open.
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