Today we struggled with getting the tubing to curve down the boxes evenly, so we took down our second loop (we started off with two loops) to make sure it had enough speed to go down even though we still have no luck with so. The frustrating thing is that each day our roller coaster is different. Either it has been moved, or the tape stops working. We learned how to feel for the marble, we basically put our fingure through the track and learned that the reason why the marble keeps on going off is because the edge the box made a bump on the track that made the marble fling off. Above is a picture of our progress so far.
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