EDIT: It turned out to be a loose lead nut. By loose, it wasn't firmly attached to the gantry. Hey guys, I hate to have to start a thread on this, but I need a quick answer. Is this backlash or a gcode error? I'm using Fusion 360. The entire cut is made with a ramp operation. The estimated time is ~7:30. If I keep the ramp and set multi-depth, the time jumps up to ~20:00. I did not try the second method as I don't have the time for that with the shear quantity to be made. Plus it shouldn't need to do that to be made correctly as the gcode preview shows the same line. The result can be seen in the first pic. The piece to the left was the first attempt. The piece to the right was the second attempt. The only difference was that I activated smoothing. The second picture is a previous cut using SketchUCam. The part itself doesn't have the same finish for a variety of reasons, but the main thing to notice is that it's actually a circle. The part is a 26mm diameter spacer with 4mm width pockets. It's being cut with a 3mm o-flute. The machine is a Sphinx made from 500mm extrusions. Up and down in the picture is the Y direction (double lead screw). Taking this thing apart just to get to the nut is a nightmare. The attached gcode is for the 4 cutouts and the outline. Any ideas? Edit: I'm asking because I can't physically find any backlash in the machine. Plus I rebuilt the X and Z axis very recently so there is zero possibility there.