Materials: Use a paper that is 8 1/2" x 11" or A4 (either: cut in half, lengthwise). For digital design, plan to print two cards on one piece of cardstock (each approximately 4 1/4" x 11," or 105 mm x 297 mm for A4). Note: Plan your design so you can trim to 3 3/8" x 10." Many printers will not print to the edges and this will ensure the pictures will bleed off the edges: top, bottom, and sides, like the example.
Tools: pencil, bone folder, art knife and metal ruler and cutting mat, academic divider (optional, for creating five equal sections)
Example: The steps shown below create a five-panel card that is 3 3/8" x 2" (79 mm x 51 mm) when all folded up or 3 3/8" x 10" (79 mm x 254 mm) completely open.
Divide and mark paper into five equal sections along the long side, top and bottom (that will be four marks).
Drawing down with the bone folder against the ruler, press into the paper to make a score that connects each set of top and bottom marks.
Start with a valley fold. Then fold the next section back on itself; continue alternating valleys and mountains along the scores.
Mark and make one horizontal slit (approximately 2" or 50 mm, centered across the fold): one across the first mountain fold (#2 of 5 folds), one across the second valley fold (#3/5). Note: if you change the scale, the slits should be the width of one of the panels.
Mark 1" or 25 mm on either side of the folds and at the edge of the paper. Make two scores with the bone folder, connecting the ends of the cut slit to the marks at the edge of the paper. Repeat for the second cut section.
Fold along the new scores: mountain folds for the first section, valley folds for the second section.
Refold the center of the first section so that where it was once a mountain fold, now it is a valley fold.
Refold the center of the second section so that where it was once a valley fold, now it is a mountain fold.