Our current roller ball pickup system for our '06 robot is somewhat sloppy, so andrew and I have started designing plates to fix it. This is my submission.
The front roller (powered by Minibike) is mounted 6.5" off of the ground, and it is 2" in diameter, it is made of turned aluminum tubing, and spins at appprox. 2-3000 rpm. The back roller(powered by FP) is made our of 3" PVC and spins at the output speed of the FP transmission.