Hi group. I have a plastic Perspex sheet (6mm thick) with a square hole 170mm X 170mm in the middle of it. I need to create a door of some sort that can be easily opened from the outside but not inside to block this space. The only requirement is the cost has to be below $2. It doesn't need to be airtight. The door must be easy and convenient to open and close. I'd love any ideas you may have..
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