Octahedron Conector

thingiverse

This is just a connector that will form an octahedron. You can use any material (4mm diameter) to make the edges - 12 in total. I used a bamboo skewer, I think it's stronger than cheap wood. You can use aluminun tubes, too. Cut them to the same length. You will have to align the first connectors, but as the assembly goes it becomes easier to do it. Fit them from inside, since the inner part is shorter. Use glue.