That's not right. It should be better than that. I can think of a few possibilities but the most likely I think is "play" also known as "backlash". The most likely thing to cause backlash is loose belts. Check that both sides of all 10 belts (short belts and long belts) are similar tightness. Inside the side blocks there are belt tighteners (springs) that should make the tension the same but you can slip a tooth. To equalize the tension on the long belts loosen the pulley screw on one of