Had to make bigger because my marbles wouldn't fit in the marble run. I put this into fusion 360 and made fillets on the edges for the guide on the rim because the marble would go then stop then go the stop because of these little bumps. On one side of my picture, there is bumps, but on the other side it is smooth because of my fillet. Good model any way.

Good model but there was bumps on my rails so it would be inconsistent and I added a fillet in Fusion 360 so now it is fine. Had to make bigger because I didn't have such a small marble.