Technology build a roller coaster

Last year in year7 in Mr P's class we got given a technology challenge. The challenge was to build a roller coaster that will hold a marble going down it. When we got into teams we were given newspaper,  scissor, cellotape and string. The hardest part was making the loops witch made the whole thing really floppy. Our marble didn't stay in the roller coaster because we didn't roll the newspaper correctly and it wasn't very stronge.  If we had to do it again we would have organized it better and had a plan. When we roll the newspaper tighter so it was stronger.