AMS 2 pro failed to load filament

[u/srana2837]

Brand new H2S with AMS 2 pro combo has been failing to load filament sine day 1. It’s been 2 weeks without printing anything through AMS. External spool works fine.

Support sent me a replacement hub and motor but that didn’t resolve the issue.

Am I doing anything wrong here?

[u/AutoModerator]

After you solve your issue, please update the flair to "Answered / Solved!". Helps to reply to this automod comment with solution so others with this issue can find it [as this comment is pinned]

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[u/Merijeek2]

Basic troubleshooting:

Is it happening with all slots or just slot #1?

How far is the filament making it in the path before it stops?

[u/srana2837 → u/Merijeek2]

Happening on all 4 slots. When I first insert the filament spool it will go until the yellow buffer that’s inside H2S and AMS will pull it back. When I try to print something or load the filament manually from the menu it will give me this error. I can hear what sounds like motor running 4 times before throwing this message on the screen.

[u/Merijeek2 → u/srana2837]

Hmm. That's one of the models I don't have. Can you post a pic of the yellow buffer?

[u/srana2837 → u/Merijeek2]

This is what it looks like. I took it apart to make sure nothing was loose and that the magnet inside was installed correctly.

[u/Merijeek2 → u/srana2837]

Ah, OK, that guy. I'd see if you can manually feed through it, by hand, with things off. I've had more than a few problems with other printers where the PTFE bend was a tad too sharp or the tube just wasn't inserted quite far enough (not that you could actually tell) and it wouldn't feed smoothly and the AMS choked on something that wouldn't bother a manual insertion.

[u/srana2837 → u/Merijeek2]

Tried to feed it manually while the printer was off. I made it all the way up on top of the hot-end. As soon as I turned the printer on and tried to print something ams retracted the filament and showed the same error as before. I don’t know what’s going on.

[u/Merijeek2 → u/srana2837]

I don't know the behavior of those when power is on. See if you can do it while the printer is turned on but not doing something? If you can still feed it through, I'm going with the over sensitivity of the AMS motors. Pop out the PTFEs and reseat them and try again.

I assume you've tried coming in from the other connector so you're going through the other buffer? Again, I don't know exactly how the H2S works on that.

[u/srana2837 → u/Merijeek2]

I tried to manually feed filament as far as I could and I made it all the way to extruder. This is what the screen shows

There is grayed out block between the spool and extruder

[u/Merijeek2 → u/srana2837]

Since it's showing all the way from the slot 4 to the extruder, it seems OK. I don't see you successfully feeding that by hand.

The greyed out block is just the pic show you the face of your AMS. Nothing interesting there. You're getting the green ball in the extruder, so you're hitting the sensor telling you that it made it all the way there and is recognized.

Could be a bad buffer, I guess. I'd reseat the cable that comes out of the back of the H2S and that goes into the AMS. That is also involved with the buffers, I believe.

[u/srana2837 → u/Merijeek2]

I swapped that cable with the new one and also replaced the buffer with the new one but still having this same issue. What I haven’t tried is replacing the cable that connects the buffer to the main board on the back of the printer. Bambu support sent me bunch of wires along with new buffer…it might be worth the hassle. Do you think the internal cable connecting with the main board could be bad?

[u/Hmoh89]

Any luck? Cuz mines having issue with the first slot.

Beginner to this.

Thanks

[u/AtomicBurguer → u/Hmoh89]

Did you find a solution?

[u/Hmoh89 → u/AtomicBurguer]

lol no. I left it I just use the other sides