Hi thanks for sharing with us, I have a question and I hope you read and answer my comment, I have one of this controller, ddcsv4 1 but for same reason I can't make a perfect circle or square I went through everything , no backslash, the configuration on te driver are the right ones before I told was the drivers, replace them same issues, get new kit servo motors and drivers , same issues, I calibrate the steps along the table to be more accurate all perfect, but when it comes to make a circle there is the problem. My cuestion is did you hade the same problem, if is yes did you solved, how? Thanks ho, also I get a second controller and the problem remains, thanks again