Hey guys: I am just trying my first shot at Sketchucam. I have created a drawing of a bracket, used SketchUCam to generate a gcode file, and tried it out on my router. The router makes the first hole, goes to the second hole position, and GRBLpanel comes up with the error: error:invalid gcode ID:33 and hangs. It loses communication with the Arduino, the COM4 port which the arduino attaches to goes away, and I have to reboot to get it back. The g-code line that it gets the first error is Line 44: G03 X29.0836 Y105.3621 Z2.8000 I0.0000 J0.9000 I don't know much about G-code, but this is the beginning of a 5mm hole using a routine called plungebore. This is the first G03 instruction of the hole. Looking at the code, I don't see any obvious errors and it is not much different from the first hole except for the xy position. Other than that the g-code is identical. I ran this twice to make sure it was not a hardware problem, but the code error occurred in exactly the same place both times. I have run the gcode through Camotics and it runs fine through the whole simulation. At a loss on this one. ***? Attached the files so you can see what I have done.