Running Brush / Laufbürste

This is a fun little toy for children and/or cats. It is a little brush with a little motor attached to it. It is a bit out of balance which makes the brush run.

This thing only provides the box for all the electronics and hides the moving parts to improved safety.
You can get the rest of the brush e.g. here: http://de.opitec.com/opitec-web/articleNumber/113794

Here's a little clip of it in action: https://youtu.be/DeFz3wQRuHg

After printing assemble it as described in the given instru