Looks great! However, I have a few questions:

Where would you have that on your robot? (middle, very front, etc)

If it's in the very front, are you aware that those multiple pieces of surgical tubing count as multiple appendages extending out of the drive base?

For the sake of this really awesome ball roller, please double check that to make sure it's legal! I'd hate to have something so awesome rack up penalties for you every time you use it.