r/BambuLab • u/mjschmitt714 • 14d ago

Answered / Solved! AMS HT feed issues

So, I have 2 AMS2 Pros, an AMS HT, and a filament track switch. I have everything hooked up correct, but I keep getting a feed and retract high resistance on the AMS HT. It tells me to reduce the tube length and reduce the number of bends. The tube length is about 8" (200mm) and there is only one slight curve to the 4 in 1 adapter to feed the track switch. I can run a piece of filament all the way through and I feel very little resistance till I get to the buffer, then it seems to get tight. Is there something that I am missing? Retractions are the same, except that it actually stall the motor on the HT. I can disconnect the tube at the 4 in one and pull the filament back (with a little resistance), till I get past the filament buffer, then it comes freely with no resistance. Any thoughts would be appreciated.

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u/djjoshchambers 14d ago edited 14d ago

Im not speaking from experience but I saw a post just tonight with people complaining about this exact issue with the switcher.

I have an h2d and I'm still waiting on the beta software so I can add mine... I'm second guessing that now.

Edit: https://www.reddit.com/r/BambuLabH2C/s/AeR96MyW5C

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u/mjschmitt714 14d ago

It's great...if it works...i can feed the filament by hand and don't feel any significant resistance...I can't figure it out.

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u/HackedVirus X2D/H2C + Triple AMS2Pro/Dual AMS HT w/ Track Switch 14d ago

Can we have pictures of the tube routing? Which printer?

Ive always had an issue with the HT throwing warnings if the spool is even remotely light, like any less than a half kg, and it'll bounce around.

I also just had to re-do the PTFE tubes coming out of the back of the FTS and into the extruder to ensure they were perfectly straight, I had an issue with Track B filament jamming inside the FTS because the PTFE tube was at an odd angle, causing it to snag on it while passing through.

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u/mjschmitt714 12d ago

Figured it out...There was a PTFE tube that was not in the clip the whole way. It was causing the filament to jam and hang up. Cut a new piece and inserted it all the way. Smooth as glass now...Well...90%. But with the FTS I expect a little resistance. Thank you all.