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Not much. As I wrote in the above description, I used mostly used parts (stepper motors, rods), scrap wood, some custom printed objects and a few screws.

Even if you'd need to buy the wood and the rods, it shouldn't cost more than a few bucks.

However, you should be able to cut the wood into shape and to drill the holes. So you'd need some kind of saw and a drill...

Of course, you'd need an Arduino (about $30) and two stepper driver circuits (about $13 each). A micro servo like the one I used costs about 3 bucks on the web.

I was in the lucky position to have lying around all of the above in my workshop, so the whole SphereBot didn't cost me anything but ab
out a weekend of construction, building and programming...