Black Straw Grids for the Vivitar 285HV

Step 7 Mark the Folds

Now mark the edges of the strip to indicate where each side of the box will fold, using a square to connect the marks. Squares make it so easy, because you only rely on the marks as a guide, not to square your line. The edge of your blank is playing that role as it pushes against the inside of the square. It's the right tool for the job.

Each side should each be this long:

Side 1: 3 1/4"
Side 2: 2 3/16"
Side 3: 3 1/4"
Side 4: 2 3/16" minus one cardboard thickness
Tab: 1/2"

So, mark the strip at 3 1/4, 5 7/16, 8 11/16, ~10 7/8, and ~11 3/8 inches.

Once you have all of the folds drawn, go back over them a bunch of times with the pen using a LOT of pressure, to score them and make the carboard easier to fold. Also notice that I'm marking all my boxes at once, reducing the need to measure stuff. Lazy... or efficient?