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        More information about nanotube: Wikipedia
    Difficulty: +12 years
    Material: squares of paper, type notepad


Building Instructions:

      Step 1: Obtaining the basic subunit


Beware! _ _ _  lines indicate that it must be bended in one direction (forward) and _. . _ indicate the opposite direction (for rear). 

          Fold until the final form can be described as two symmetrical triangles which open to opposite sides. This video shows how:

Step 2: Doing a vertex

Once we have this basic subunit, for the construction of a vertex is required to join 3 subunits. As shown in the following illustration:

          formar vèrtex

In Figure 1, it is necessary to open a bit the layers of the blue piece to put inside it the yellow subunit. Then we will need to open the layers of the yellow piece to put the red one inside it (Figure 2). Finally we open a little the layers of the red piece and put inside the tip of the blue piece, obtaining Figure 3, which is the complet vertex. You can see the process in the following video:


Step 3: Assembling of the Nanotube

Starting from Figure 3 we will add more subunits to this vertex to create new vertexs. For example, the free part of the yellow subunit of Figure 3 is used to start forming a new vertex.

Once mastered how to form vertices and how to join it with the other pieces we can start the construction of Nanotube. First one has to form one of the tips. It consists of pentagons and hexagons like the following pattern shows:

pnuta nanotub

The three pictures represent different views of the tip of the nanotube. You can see that there is a central pentagon  (red) surrounded by hexagons (green), then comes a third layer formed by pentagons and hexagons (yellow and blue). One should be very careful about which position takes the pentagons and which one the hexagons in this third layer because the curve shape depends on that.
Once built the tip one only has to extend the tube by adding hexagons. When the tube is of a size you like (should not be very long because the paper gets too much heavier) you have to close the structure by building the other tip.