That’s going to have nothing to do with your issues. No ones parts are perfect. They are 3D printed. Edges like that have no bearing on a design like this. So long as all your bolts and bearings line up, the outside of your prints not being square will have NOTHING to do with your device being square. The issue is your device isn’t square. Or your electronics are not working properly, or your belts are loose, mis-tightened, one side is tighter than the other, causing flex under tension of the motors…they’re are a million reasons why it’s not acting correct. You could have a bow in your pipe that you can’t see…Your outside frame should be dead nuts with Ted’s new corner pieces. Your Z should be square and rugged with his new Z assembly.