I have noticed that not all of my engravings are coming out in straight lines. It is not as bad inside certain parts of the laser. It is really bad with QR codes so I put a 12"x12" piece of 3mm plywood and engraved 3 locations and there is a big difference in the 3 QR codes. I attatched an image with the QR codes and the X-Y coordinates of each that is listed in the XCS software. Not sure what to do to fix this.