I’m still sticking to my original idea, but I’ve changed my process considerably. Instead of using pulleys and belts, I’ve just decided to make a raised platform and have a moving robot underneath it. The robot will have a magnet, which will move the ball above the platform. It will make no difference to the user (hopefully), but will make the implementation much easier. I realized I would also need lots of other tools to execute the idea the way I had originally planned, and I’d have to purchase them myself. If I use a moving robot, I can just use the stuff that’s around the lab.