This is basically a wood and glue robot, but it’s sturdy enough for running around a tabletop and that’s what counts.

As you can see, it’s also quite small — not much bigger than an Arduino or a computer mouse.

What happened to foambot? The foam wouldn’t cut easy enough. So we’re back to wood.

This is the cheapest robot yet, coming in at about ten dollars in materials. Add in labor and handling, and it comes to about twenty dollars for the kit.

This isn’t ready for Amazon yet, but it’s getting closer all the time.