This was a mechanical issue (most likely lost steps) or an electrical issue (loss of continuity on the motor signal causing lost steps) — did you hear any odd noises? If so, electrical, check the wiring.
Per the machine operating checklist: Machine Operating Checklist - Carbide 3D , the basic points of adjustment for a machine are:
- Pulley set screws: Checking Pulley Set Screws - Carbide 3D — be sure to check all axes/pulleys including Z.
- V wheels / eccentric nuts: http://docs.carbide3d.com/support/tensioning-eccentrics
- Belt tension (see the relevant step in your instruction manual, e.g., Step 5 Belting - Carbide 3D) Note that the X-axis motor is held in place on standoffs and if those bolts are loose this can cause belt tension issues. Also, belt tension for the Y-axis stepper motors needs to be even/equivalent on each side — a significant difference can cause skipping on one side eventually resulting in lost steps on both. Measuring belt tension, squaring and calibration
For the wiring, if you don’t find anything obvious to address, write in to us at support@carbide3d.com and send us photos of the wiring of the motor in question, including the wiring extensions and at the controller.