Changing the filament colour at a certain layer is not something that can be programmed in so you have to watch it like a hawk. And pausing the print often cancels it or messes up the print itself. But if it works it's nice. The first two pics are my fourth attempt to get it right. The 3rd pic is of the attempts that cancelled when I tried to pause the print or messed up after resuming it.When I tried to post the print review after the system said the print failed and deleted the time lapse even though the print was finally successful,and then it wouldn't let me post a review.