Step 3Prepare the Cardboard
You have to cut your cardboard so that each single layer lays flat, and is completely filled with cardboard. The look and strength of your lumber will all depend on how well you cut your cardboard layers up. It would be best to have all cardboard meet at hard, squared off corners.
To prepare your raw cardboard boxes, you have to cut all of them into flat rectangles, removing all tape and anything you can to make them just cardboard rectangles.
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