Thingiverse member Artharis posted up plans to create a 3D printed animatronic tail that is controlled by an Arduino. Using open source OpenSCAD software, you can specify how many vertebrae you would like, and the software will spit out the .stl files for your 3D printer. In the video Artharis uses 10 vertebrae, plus the tip of the tail.
Now, we just need someone to make eight of these, power the servos with the Adafruit servo controller, and squeeze the whole thing in a octopus stuffed animal.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.