I got one of those GRBL control boards ($15!) and hooked it up. Initial impression was very good. It worked right out of the box.
Now I’ve run into an issue that I’m hoping someone has seen. I was cutting some Chinese lanterns yesterday to test it, and on two of the complex shapes, it omitted several of the points. For example, one shape is a snake. I think it has about 30 points. After it got through about half the snake and was about to go around and do the other side, it just went straight back to the initial point, as is if just skipped the rest of the steps in the cut. It did the same thing in another complex shape. Everything else seems to work fine.
When I look at the gcode find in GRBL sender, the preview correctly shows the entire snake, so I believe the gcode is correct. Tonight I’m going to try to cut the same thing from the computer and see if the issue happens to be in the GRBL Arduino firmware. My only guess at this point is a memory size limitation or something, although I’d think that I’ve cut things this complex before.
Any thoughts?