Modular Origami - Sonobe Triambic Polyhedron

Modular Origami is a form of origami that utilizes many identical units to create a large geometric piece. Each unit, called a Sonobe unit, is often extremely simple and sturdy, so the resulting structure is strong and stable. This Sonobe unit creates triangular mini-structures, so it can be used to create small cubes to much larger structures with many more faces. As long as each unit is completely identical and well-formed, the versatility of this project can be adapted to many different uses.

In this Instructable, I will be using mostly used Post-Its and 3x3 squares of scrap paper, as it is a good way to reuse trash to make something fun.

Sonobe units need to be made in certain amounts. I made 30, but you can make 6, 12, 90, or 120 units to complete a polyhedron.

- Post-It notes (used or unused)

- Or, 3x3 sheets of paper

Crease lengthwise, then open it up again so it is flat. Make sure corners are lined up and edges are aligned as to make a perfect fold.

Open back up so it is flat after creasing.

Align the top or bottom edge with the creased line. Always fold the top left and bottom right corners for each Sonobe unit. This ensures that all the units will interlock with each other.

The corner flap may poke out a bit under the fold from this step when you attempt the fold, so be careful in ensuring that all folds are near perfect for all units.

If the little flap from the last step is messy or out of place, this fold may be slightly disturbed.

Align the top or bottom edge with the side edge. Crease this side particularly well.

Then, turn it to the other side keeping the points in order with the indicated positions.

The Sonobe unit utilizes pockets and flaps to interlock as many pieces as you want!

Triambic points are made with 3 units interwoven with pockets and flaps. Insert the flap of one unit into the pocket of another. Repeat until an entire polyhedron is made!

Mine uses 30 units, but can be made with different amounts to make different sizes. Experiment with different paper patterns or simply reuse all of your stickies!