¶ What it is
HMS_0700_4000_0002_0004: The filament buffer signal is abnormal,the spring may be stuck or the filament may be tangle
When using AMS, the buffer (or AMS Hub) is connected between the AMS and the printer.
It has a slide, a spring, and a hall sensor. When the AMS pushes the filament into the tool head extruder, the slide will move forward due to the pressure of the filament. The hall sensor can then detect the displacement and location of the slide, and feedback that signal back to the AMS and the printer. If the spring of the buffer gets stuck, it prevents the slider from moving to the far right, which affects the AMS feed.
¶ Error message:
“The filament buffer signal is abnormal, the spring may be stuck”.
¶ Operation guide
When you see that the spring of the buffer (or AMS Hub) is stuck, as shown below, please adjust the spring to ensure that the slider moves smoothly from side to side.
Another possible reason is that the filament is tangle or the spool is stuck and cause excessive resistance:
If the error persists after adjusting the spring, please upload the log file and contact the customer support team.