Hi all. Using the X1C with latest firmware.
The option to auto switch filament is enabled.
My Bambu PLA basic ran out on slot 3 and I all other slots I had other PLA filaments.
I got a message saying that I have to load slot 3. The auto switch didn’t happen.
Any ideas why?
Did you have the same color selected in the AMS ?
Sample:
Slot 3 = Black PLA
Slot 4 = Black PLA
Does it have to be the same color? I thought just having the same properties is enough.
Ya has to be the same color.
But you can trick the AMS if you don’t care if your part has two colors.
If you are using the Bambu labs filaments then you would have to remove the rfid tag or use one with the same filament information.
Got it. And if I use other brand filament, I should just configure AMS to think the next slot is the same color, right?
( if I use other brand filament, I should just configure AMS to think the next slot is the same color, right? )
Yep same color and type 
It has to be the same color and the filament properties also need to be same.(type, temp, etc.)
Both slots also have to shown in Bambu Studio during slice / print (per Bambu support)
I’ve seen mine switch Bambu Basic PLA Black with Matte PLA Black with no extra input from me, other than checking the box to allow the auto switch.
3DTech, As long as it isn’t a Bambu RFID tagged filament, I can’t see how it wouldn’t work.
I had a similar failure when the filament ran out in slot 1. Slot 2 had the same PLA and same color. The AMS was set to backup, too. When slot 1 ran out, the LED turned red and the printer kept going, using what was in the tubes. When the extruder ran out, the AMS hub motor started, but the first stage did not feed anything. The slot 2 LED stayed solid white. The printer kept on printing with no filament and the AMS hub motor kept running until i stopping the print manually. I have submitted a trouble report, but not heard back yet.
Hi cornpone47,
What AMS firmware you running ?
X1/X1-Carbon and AMS Firmware Release History
This was from AMS version 00.00.05.75 (20221217)
The AMS will switch to another spool with the same filament properties automatically when the current filament runs out. These filament properties include brand, type, color, and nozzle temperature. If the AMS cannot find the same filament, it will display a prompt that the current slot has run out. To enable this feature, please check “AMS filament backup” on the AMS settings page.
Tips:
a. Currently, the RFID information of filaments cannot be read while printing, and the information of non-Bambu filaments can not be edited during printing. Please configure the filament information before printing.
b. This function requires filaments with exactly the same properties. It is recommended that Bambu filament be used as a replacement for Bambu filament and non-Bambu filament be used as a replacement for non-Bambu filament.
I have 2 AMS both running 00.00.06.32. The AMS Hub is at 00.00.00.42. The error occurred on the second AMS.
Ya I have just seen some posts not on this website with AMS firmware 00.00.06.32. not switching filaments 
I’m using an older firmware with my AMS with no problems.
Let hope your report get a solution soon.
Have a good one
That’s what I’m saying, they weren’t exactly the same. One was Bambu Basic and one was Bambu Matte. Both were recognized by the RFID, so unless my AMS made a mistake, they may only care about color and material type.
Well the good news is it worked for you 
I was just wondering what settings do you have in your AMS ?
Definitely surprised me after reading the notes on the AMS page. But with that said, it may be specific to these Bambu Lab filaments. At high speeds, sometimes the Basic and Matte can look very similar. In the part I printed I literally can’t tell the difference. So I can see why Bambu could put an exception in for those two. BTW, in the picture the blend was around the 75-80% complete mark.
I have had the same problem with the new firmware (thanks, 3DTech, for the tip). I reverted back to the 00.00.05.96 firmware and the filament backup worked perfectly.
With the new firmware, the filament backup didn’t work. Same PLA in Slot 1 and 2. When Slot 1 ran out and the extruder was empty, the printer kept going, and the panel showed that the spool holder filament was loaded instead of Slot 2! There was no filament on the spool holder, but it kept “thinking” that there was PLA on it and was trying to use it.
I have submitted a trouble report with videos to document this issue.
Sorry missed your inquiry, Yes I have all 4 options checked, Insertion Update, Update on Start, Update capacity, and AMS Auto Switch. Not sure I’ll keep the startup option because of how long it takes but, I’ll keep it for now.
As for the OP, the color is a definite hurdle. Ditto on what 3DTech mentioned, just configure it. If you want to switch even if the colors are different you’ll want to trick the AMS in to thinking they are the same in the manual configuration.
Just verified on my P1P with latest software that it not only did it
auto switch once, but twice when my two filament rolls ran out.
I keep all my AMS slots set to same type and color and never sync them.
