GigaBrain controllable robot critter that you can easily extend and connect other parts with it. Does not require any screws, parts are easily switchable.

You can add a connector to your own robotic parts easily, like a robotic hand or a sensor. Just merge the GigaBrain Hinge Extension.stl part to your own 3d model.

Add 9g micro servos to the GigaBrain_Critter_SingleLeg6.stl and GigaBrain_Leg_Extension_Combined__Cleaned_Smaller_with_servo_hole.stl

Control movement with a Raspberry Pi and PCA9685 at http://gigabrain.io

You can use these extensions also in Vorpal robot to extend Vorpal legs or other Hexapod Quadruped or Bipedal models.
Videos
https://youtu.be/5GhJHp8dhHQ
https://youtu.be/LRnZ59parfI
https://youtu.be/usXplbTZGzA

See also an addition hinges
https://www.thingiverse.com/thing:2836995
Special Body Hinges
https://www.thingiverse.com/thing:2847535
And the Case
https://www.thingiverse.com/thing:2838221