Tip: If you use liquid super glue and soak the paper carefully, the structure will be very strong.
P.S: Sorry if my English is bad.
Step 1: What You Need
- razor knife
- dodecahedron template (http://intermath.coe.uga.edu/tweb/gwin1-01/apley/Dictionary/Solids2/GIFs/dodecahedron/2dodecahedronTemplate.gif)
- icosahedron template (http://homepage.math.uiowa.edu/~goodman/algebrabook.dir/2dgraphics.dir/icosahedron_bottom.gif)
- cube template (http://www.mathsisfun.com/geometry/images/cube-model.gif)
Step 2: The Cube
Draw it so that the edge is 1,5 cm long , the flap is 2mm thick and the inside square has a distance to the outside square about 2mm
Step 3: The Icosahedron
The edge of each triangle is 2cm long, the flap and inside is the same as the cube
Before you close it completely, add the cube inside.
Step 4: The Dodecahedron
Before you close completely, add the icosahedron
You should to make 2 layer for this piece since it will take the most pressure