I have just finished my biulding my printer I got it all calibrated but when I go to print something it will shift over and then it will go up from that point but the edges of the print will be bumpy and rugged like it slightly shifting over and then back I have watched the belts and I don't think they are slipping and I have adjusted the stepper motor current and I can make it worse but I can't seem to make it better and the bigger the print object the more it shifts but the bumpy edges states the same.