Recycled cardboard stooly.
Previously:
Cardboard and plastic bucket mousetrap - GIF
Cardboard canister step feeder and scoring machine - GIF
Cardboard packaging padding shredder - GIF
Cardboard sniper rifle - GIF and video
Cardboard tetris game - GIF
Coin sorter made from cardboard - GIF
Homemade cardboard gameboy - GIF
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