Hugbot is a soft robot which gives small hugs. Its arms are made of custom 3D printed vertebrae and actuated by fishing wire which is threaded through the vertebrae to stepper motors controlled by an Arduino inside its body. Hugbot was born of an interest in making something soft and squishy which could move based on its outside environment.

Hugbot Joints.stl contains the vertebrae used in Hugbot arms which enables the arms to flex.

Instructions on making your own Hugbot are on Instructables.