The STEAM Gem build system is made from 3D printed tendons and paper drinking straws. Imagine a peg that is just the right size so that it fits snugly into the tip of the straw. Now split the peg into two halves and attach each tendon to one of the halves. The picture on the right shows tendons from a spherical tensegrity. If you look closely you can see the two half pegs partially inserted into the straw tip. The tendons are printed with a material called TPU, which is stretchy.