Bambu P1S with AMS bundle
Orca slicer, with the “same” filamnet loaded in slots 1, 2, and 3.
Running out “scraps” of old PLA, I wanted to print a functional part (gridfinity boxes) as per-object printing. After spool 1 ran out, printer resumed to spool 2, and then spool 3.
Spool 3 was almost new, so never ran out.
On the NEXT print, loading colors into slot 1 and slot 2 (dual-color print). In the FIRST color change, ran into the “Failed to unload from extruder” and the filament was super tight. De-coupling the PTFE from the buffer, confirmed “slack” filament all the way to the print head, but towards the AMS and it was impossible to pull manually. The tightness seemed to be from the “secondary” feed motor (the one at the back of the AMS).
This seems to be re-producible - as it’s happened to me twice now (the previous time was about a month ago), with the same symptoms. However, I don’t have a lot of “scraps” left to retest…
Wondering if anyone else has run into this? The P1S with AMS has been amazingly reliable, so this “failure to unload” issue stands out in my mind, and the only common symptom I can think of it both times it was when the PREVIOUS print ran out that slot.
Anyone willing to test on X1 or P1 machines…
- Run out a spool (letting the AMS Auto Refill from another spool - mark which slot you let run-out)
- load a new spool into the run-out slot and start a new project with that spool
- observe that the AMS will NOT retract properly after print completion (or a much more severe “motor torque” sound is heard, and the head tries the “unload logic” twice - it moves back from the chute to cycle around the printer, before returning to the chute and re-trying the retraction)