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Step 3Piece together the Light Box Part I
Measure a 2 in. margin on all sides of the cardboard backing, and mark it with Sharpie.
With a utility knife, remove the area within the margin.
Set aside the 2 in. wide cardboard frame and measure the remaining area. In my case, the resulting rectangle of cardboard measured 20x32. It should be approximately equal to the measurements of the poster frame less 4 in.
From another piece of corrugated cardboard, cut the following:
2x - 2.5 in. x (Length of the cardboard rectangle)
2x- 2.5 in. x (Width of the cardboard rectangle)
Retrieve the cardboard frame and duct tape the slats to the inside edges of the frame, perpendicular to the plane of the frame, making sure to tape them securely.
With a utility knife, remove the area within the margin.
Set aside the 2 in. wide cardboard frame and measure the remaining area. In my case, the resulting rectangle of cardboard measured 20x32. It should be approximately equal to the measurements of the poster frame less 4 in.
From another piece of corrugated cardboard, cut the following:
2x - 2.5 in. x (Length of the cardboard rectangle)
2x- 2.5 in. x (Width of the cardboard rectangle)
Retrieve the cardboard frame and duct tape the slats to the inside edges of the frame, perpendicular to the plane of the frame, making sure to tape them securely.
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