this post was submitted on 12 Jun 2025
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Help with Bambu AMS (retraction) (files.catbox.moe)
submitted 1 day ago by ShortCircuit908@lemmy.blahaj.zone to c/3dprinting@lemmy.world
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I have my Bambu A1 set up in a very tight space, so I made use of the AMS Micro by emics to mount my spools vertically.

The printer is able to reliably load and unload filament from all four spools, but during printing (especially slot 4, the topmost spool), particularly after retractions, the extruder will be unable to re-insert the filament and will throw an "extruder is not extruding normally" error. I can manually push the filament in until it's grabbed by the extruder after which the print will continue normally until the next retraction.

The spools spin freely on the stock AMS hubs and the PTFE tubes are short and not worn. Any advice would be most welcome

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[–] roofuskit@lemmy.world 2 points 18 hours ago (1 children)

Suspend your AMS from the top of the enclosure after putting it back together.

[–] ShortCircuit908@lemmy.blahaj.zone 1 points 15 hours ago (1 children)

That's actually how I had it set up to start, zip-tied under a wire shelf. That configuration takes up a lot more room and leaves very little for filament storage, so that'll be my last resort if I can't figure out any other way

[–] roofuskit@lemmy.world 2 points 15 hours ago

I'm guessing the angles are not playing nice with the mechanisms. It was designed down the the penny so there's probably not a lot of extra torque in the system to compensate for new angles and friction when you mess with the layout.

[–] PhatalFlaw@lemmy.world 3 points 1 day ago (1 children)

Potentially rig up some PTFE tube holders that stick to your wall to ensure the filament enters the AMS motors' yellow areas at a perfectly straight angle, I bet the filament is just getting "sticky" with any drag on those parts.

[–] ShortCircuit908@lemmy.blahaj.zone 1 points 15 hours ago

A good idea, I'll try to rig up some magnetic tube holders to keep it aligned

[–] moody 3 points 1 day ago (1 children)

Have you tried moving the spools around? Could be the AMS system is struggling with that one specific tube, or it could also be that the curve in the filament is making it hard to pull it into the extruder.

You could try feeding a lower spool into the tube that is currently holding the upper spool to see if that changes anything.

[–] ShortCircuit908@lemmy.blahaj.zone 1 points 1 day ago (1 children)

That's a good idea, I'll try that

[–] ShortCircuit908@lemmy.blahaj.zone 1 points 1 day ago

No dice. Slot 4 fails most frequently but all slots are affected one time or another