¶ Fault Description
During the AMS feeding process, the assist motor pushes the filament to the tool head extruder. During this process, it needs to overcome various resistances including spool rotation resistance, tube resistance, and buffer spring resistance. The assist motor measures the resistance in real-time and will prompt an error when the resistance exceeds a certain value.
Fault Symptoms
- HMS displays "AMS/AMS-HT [x] slot [x] feeding resistance too high...". Furthermore, the extruder wheel connected to the assist motor may wear the filament, or even cause filament slippage during feeding.
- Unable to feed the filament into the buffer, and the buffer slider cannot reach the intended position. AMS will automatically retract the filament and retry feeding.
- If multiple retries fail, the machine will display a popup warning about AMS filament feeding failure or extrusion failure.
¶ Troubleshooting
¶ Required Tools
H2.0 Hex Wrench
H1.5 Hex Wrench
¶ Troubleshooting Steps
¶ 1. Manually rotate the spool mentioned in the alert to check if it moves smoothly.
Common causes of spool rotation blockage include:
- Using non-standard spools, such as spools with incorrect diameter or width, causing friction with the AMS structure
- Too much filament loaded on the spool
- Tube tilted or not properly positioned
¶ 2. Check Tube Resistance
- Remove the tube from the AMS outlet
- Manually feed a piece of filament through the tube to the extruder until the buffer is fully extended. Check if there is excessive resistance during this process.
Below shows the buffer diagram. When the buffer is fully extended, the slider in the middle of the buffer moves to the rightmost position.
- H2D Buffer
- X1/P1 Buffer
- If the resistance is too high, adjust the tube placement.
Example of correct connection with smooth tube and low resistance (using H2D as example):
Example of incorrect connection with twisted tube:
- If the tube is too long, shorten its length.
A shorter tube can reduce feeding resistance and shorten material change time.
¶ 3. Check if the Filament Buffer is Stuck
Manually check if the buffer can slide smoothly to both the leftmost and rightmost positions. If there are sticking points, check:
- If the tube connectors at the buffer inlet and outlet are properly installed
- If there are filament debris inside the buffer tube
¶ Equivalent Codes
The following HMS codes all represent the same type of fault.
| Code | Description |
|---|---|
| 0700-2000-0002-0025 | AMS A Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0700-2100-0002-0025 | AMS A Slot 2 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0700-2200-0002-0025 | AMS A Slot 3 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0700-2300-0002-0025 | AMS A Slot 4 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0701-2000-0002-0025 | AMS B Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0701-2100-0002-0025 | AMS B Slot 2 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0701-2200-0002-0025 | AMS B Slot 3 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0701-2300-0002-0025 | AMS B Slot 4 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0702-2000-0002-0025 | AMS C Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0702-2100-0002-0025 | AMS C Slot 2 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0702-2200-0002-0025 | AMS C Slot 3 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0702-2300-0002-0025 | AMS C Slot 4 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0703-2000-0002-0025 | AMS D Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0703-2100-0002-0025 | AMS D Slot 2 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0703-2200-0002-0025 | AMS D Slot 3 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 0703-2300-0002-0025 | AMS D Slot 4 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 1800-2000-0002-0025 | AMS-HT A Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 1801-2000-0002-0025 | AMS-HT A Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 1802-2000-0002-0025 | AMS-HT A Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 1803-2000-0002-0025 | AMS-HT A Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 1804-2000-0002-0025 | AMS-HT A Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 1805-2000-0002-0025 | AMS-HT A Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 1806-2000-0002-0025 | AMS-HT A Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
| 1807-2000-0002-0025 | AMS-HT A Slot 1 feed resistance is too high. Please reduce the feed resistance, decrease the rotation resistance of the spool, and avoid having the filament tube too long and excessively bent. |
¶ End Notes
We hope this guide provides helpful information and assists you in resolving the issue.
If the issue persists, please contact online technical support (service hours: 9:00–21:00). We are always ready to assist you.
If you have any suggestions or feedback regarding this Wiki, feel free to leave a comment. Thank you for your support and attention!