I do have a dial indicator. it has always cut ever thing fine. I’ve cut complex 3 foot signs and everything cuts out without a problem including the outer perimeter. The only reason I notices was because I built a bracket and ever thing in the program measures correct but the holes didn’t line up so I compared the program to the tape measure and found everything is off. I’ve checked the couplers a few other times and everything is as tight as I can get it. If they were loose I would be short of my measurement though not long so somehow my stepper motors are not calibrated correctly.