[MrForbes]

Apparently 148 spent a few weeks figuring out how to make theirs work well. We spent a significant amount of time on ours too, with not quite so good, but still usable results.

One way to make the thing work is to have a really sticky material, and have it spin very fast, and have it mounted kind of low on the ball. We did not figure out how to make it work like this, though.

Another way is to have a normally grippy material (wheel tread?), have it spin kind of slow with a lot of torque, have it mounted as far up/forward as possible, and have a low friction part that meets the ball sort of low on the robot behind the ball, and prevents the ball going under the robot. This is what we did.

The 3" incursion rule makes it challenging.