AMS Feeding Failure – Causes and First-Step Troubleshooting
When the AMS repeatedly enters a load–unload cycle and cannot feed filament to the tool head, the issue is typically caused by poor 6-pin cable connections, a stuck buffer slide or spring, or a fault in the AMS buffer or main board; begin by securely reconnecting the 6-pin cable between the buffer and AMS, then check the cable pins if the problem persists.

Step 1: Check the Buffer Spring and Slider
Inspect the buffer to ensure the spring is not stuck and confirm that the slider moves smoothly from side to side.

Step 2: Check the AMS Internal Connections
Verify that the internal bus cable inside the AMS is not loose; unplug and reconnect it, then try loading filament again to help determine whether the cable is the cause, and if available, use a multimeter to perform continuity checks on all pins.

Step 3: Measure the Voltage
If the bus cable continuity is normal, unload the filament and ensure the AMS buffer slider is positioned on the left, then measure the voltage across the pins of the unplugged 6-pin cable, confirming it matches the expected values, as the reading will differ if the slider is not fully left.