A fun little item to print with flexible PLA. I like to think of it as a miniature robotic spine. This design flexes in one direction somewhat like a finger. I hope to design another with 3 string to facilitate 2 directions for something more like a neck

Prints all at once the only assembly required is to add a length of string

You can see it moving around here: https://www.youtube.com/watch?v=uF-5lWgYl-A

I recommend printing in flexible PLA. I haven't tried printing in a regular PLA or ABS. I printed 100% solid. I found that I had to print Ultimaker's flexible PLA filament hotter than normal. I use 230

Once its printed cut a length of string (i prefer fishing line) and fish it through the holes in the base and up through the little eyelets to the tip. Tie the ends to knob at the end (not to any of the little eyelets, as they tear easily)