Connected Linkage, Pendulum, Flexible Pentagon

###Connected Linkage, Flexible Pentagon, Pendulum

I was playing with connected bars and came up with these structures, for which I don't have a proper name. However, they seem to be fun to play with. Of course, one can use it to fit a curve or corner.

### Three Versions
1. a connected pendulum (length: 5)
2. a pentagon with (0, 1, e, PI, i)
3. a pentagon with nothing on the nodes.

Please be careful when removing them from the printing bed. The bar might break. When they happen to break, please try a drop of super or gorilla glue ^_^.