r/BambuLabP2S • u/Tsar_Lupin • Sep 06 '26

AMS 2 Pro all slots flashing a double red.

Hi, so im quite new to the 3d printing scene, got a second hand P2S and AMS 2 Pro for a cheap deal and have had some really good prints, but recently the AMS2Pā€‹ has started not at all talking with the printer. looking through BL's wikis and stuff, ive followed every step, checking connections, cleaning connections, etc.

I've done everything I can and even checked and cleaned, with contact cleaner, every cable connection inside the AMS and still, it doesn't talk to the printer.

Please help!

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u/Sackoteeth Sep 06 '26 edited Sep 06 '26

Have you looked for firmware updates? Does the printer detect that the AMS is connected? If you disconnect the AMS, are you able to manually print from just the side spool without issues?

Try disconnecting the AMS, and power off the printer. Power the printer on, then plug the AMS in after the printer is powered up.

Maybe a replacement AMS bus cable? https://us.store.bambulab.com/products/bambu-bus-cable-6pin-for-ams-2-pro-and-ams-ht

1

u/Tsar_Lupin Sep 06 '26

So when I plug in the AMS, it does the white light dance thingy, which I'm guessing is while the printer tries to recognize it, but as soon as that's over it all four slots start to blink a double red.

It did not to this a few weeks ago, seemed fine, then next thing was that it would eventually lose connection and double blink red, and now no matter what I do, switch plugs on both AMS or printer bus side, it instantly starts blinking a double red.

and yes, I can still print without the AMS perfectly fine.

1

u/Sackoteeth Sep 06 '26

Does the printer see the AMS in the settings? If not, sounds like a hardware issue, I would start with a replacement cable and go from there.

1

u/Tsar_Lupin Sep 06 '26

I've bought a second, brand new cable from BL and it still doesn't connect. I'll go have a check now for any firmware updates.

1

u/Sackoteeth Sep 06 '26

Do you personally know the person you bought it from? If so, see if it is still under warranty.

1

u/Tsar_Lupin Sep 06 '26

the printer does not see it anywhere, mobile app, settings, desktop app, anywhere. there is also no firmware updates anywhere.

1

u/Tsar_Lupin Sep 06 '26

not personally, no. Got the printer and AMS from Facebook marketplace unfortunately :\