This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/73jGok9WHmT

It has two parts. One of them (micro-legs) is printed in filaflex, and the other one is printed in PLA. The goal is to make the simplest robot a child can build.

You will need a vibration motor (like the ones in mobile phones) and a battery of 3V.

A video of the result can be seen here: https://youtu.be/rJDar60V7Gg