Bambu Lab HMS error code 0700-2000-0002-0002 is an AMS assist motor overcurrent fault within the 0700-2000 AMS motor subgroup. Suffix 0002-0002 indicates that the motor driver detected an excessive current draw from the assist motor — a condition that triggers automatic shutdown to protect the motor and driver circuit from damage.

What the Error Means

Overcurrent in an AMS assist motor almost always indicates the motor is stalled against a significant mechanical load. Unlike a gradual increase in feed resistance, an overcurrent event is sudden and forceful — the motor attempted to push or pull filament through an obstruction that caused an immediate stall. The most common scenario is a severe filament tangle, a hard kink in the PTFE guide tube, or a filament type that is too rigid or brittle for the AMS feed force.

Step-by-Step Fix

1. Power off the AMS to release any motor current. Do not attempt to force the filament by hand while the motor may be energized.
2. Open the AMS top cover and remove the filament from the affected slot.
3. Inspect the filament for kinks, tight curls, or brittle sections that could have created the obstruction. Very old or moisture-absorbed PLA can become brittle and snap inside the AMS.
4. Check the PTFE tube within the AMS slot for kinks or crushing that may have restricted the bore.
5. Carefully push a short length of new filament through the slot from both ends to confirm the path is clear.
6. Reload the filament and initiate a slow, manual load from the printer menu while watching for resistance.
7. For brittle filaments, reduce the feed speed in your AMS settings if that option is available, or dry the filament before use to restore flexibility.

Parts Required

• Replacement PTFE tube section if the internal tube is kinked
• No motor replacement is typically required if the obstruction is cleared promptly

If overcurrent events recur with fresh, pliable filament and a clear feed path, contact Bambu Lab support for motor torque calibration or driver inspection.