Hmm, I'm not sure. I do the best I can. Sometimes I rip and try again, but mostly I just do my best to make the pieces fit. I try not to make this hobby hard work. I try to learn something on every piece I make and then move on. If one block doesn't come out the best, then I try to learn from it and do the next one better. I want it to be fun and relaxing. We can be too hard on ourselves.