gCreate Spaceship- Fullsize print with questions

right, that's what you guys were narrowing it down to, I was just wondering if you guys figured out which one of this if any was the problem, because they all would make sense to contribute to that sort of rippling effect.

If I remember correctly he said he tightened the belts, slowed down the speed, and found that one wheel that rubbed on the plate, but fixed it...but the prints still produced the rippling effect after all those changes. So what is the problem?

thanks.

I think friction in the y-axis carriage was the main source of the problem.