I made Ace of Sharks a four wheel drive robot! I modified a wheel hub from Printables to have a pulley for a belt on it, but Fusion did not like working with a mesh converted to a solid and I could not finish it. So I had to start over with Fingertech twist hubs (files free on their website) and added the pulley to the twist part of the twist hubs. When I was making the belt, I was doing a bunch of math to get the size and it turned out way too big. Then I realized the number I calculated was the circumference and I was using it as the diameter. That fixed it! Next, I will need to print out the parts and see what problems I missed in the CAD.