As the job progresses, subsequent passes are cutting off the path of the design, often in the Y direction.
Possible Causes
- Stepper motors aren’t getting enough current
- Wiring is loose
- Check your machine's wiring diagram and triple-check connections are fully seated
- Feeds and Speeds are too aggressive
- Material wasn't secure
- Belt isn't being gripped by pulley properly
- The Arduino has a bad copy of Grbl (reflash the Arduino)