I have read through all the FTS posts I can find so one last view before i take it out
H2D with 4 ams pro 2 though 2 4:1 splitters - all good, no errors, everything happy
Added FTS , leaving all tube lengths i had before the same and just added two to the FTS output as per instructions
immediate moans about tension etc, brought new BL tubes and shortened to compensate for the FTS but still error, tried taking out the 4:1 as a test still error, removed FTS no errors.
it feels like a cumulative issue, the system is sensitive and the 4:1, extra tubes and FTS seem to just push it over the edge of what it will accept
any final ideas before just take it out as a write off?
Just from my experience, it’s likely the filament path. You have a bend or something it doesn’t like. I have 3 AMS 2P’s and 1 HT going to my H2C without issues through the FTS.
Yes. The FTS adds additional resistance to the filament feed path. That’s why Bambu released the PTFE tube guides and is very prescriptive about how the PTFE needs to be set up when using the FTS.
Two questions - are you using OEM Bambu PTFE?
Have you removed the wipers from inside your 4into1 connectors?
So I don’t use the guides or OEM PTFE tubes. Maybe that is why i’ve had good luck. I printed the guides but never installed them; I just added small pieces to connect the FTS. I also still have the wipers in my 4-1’s. I have also purchased PTFE from Yoopai on Amazon, same 2.5 mm ID. It was cheap and has never given me problems.
not all ptfe tubes are created equal, some have far greater resistance than others, also slight deviations in id and non-perpendicular cuts can induce higher resistance. and then there is wear…
Hi, I converted my H2D to an H2C. I’ve been using the FTS since it first came out. My setup involves two AMS-HT units and two AMS Pro v2 units connected via two 4-to-1 adapters; I use the AMS guides and Bambu PTFE tubes. I designed the mount for the FTS switch to ensure the best possible connection for my AMS units, whether they are positioned on top of the printer or to its right. My son has a similar setup with three AMS Pro and two AMS HT units on the right side of the printer. We haven’t had any issues with the FTS, though it is important that the PTFE tubes are cut carefully and straight. It is also good to deburr the respective PTFE inputs inside. The entire filament path should be checked for hard transitions by means of a piece of filament after assembly. At the beginning we sometimes had a too high fraction false message but the filament path seems to grind in a little over time and the errors then no longer occur. Greetings Olaf
I’d check the whole filament path for tight bends or extra friction before giving up on the FTS. With four AMS units, the added tubing and splitters may be enough to push the system past its limit.
One more point, I have no issues with print quality. I’d go as far to say I don’t see how it could be better but I always get the error so it’s not enough to change the print but it’s just enough to throw an error
Just re-created the whole thing. Moved the FTS to a side not back location made the ptfe no longer than 700mm and made sure all tubes were not under too much bend or anything
immediate error again with the FTS, logging a ticket then returning it if they don’t have any great ideas
it prints it just errors and occasionally gives me an overload warning then stops but thats rare
When you stand there and it loads the filament it moves fast and when it hits the FTS you get a semi kind of grinding noise like its rubbing on something then when it comes out the other side its moving at about 1/4 of the speed it was before it went into the FTS
You can audibly hear it trying but getting resistance in the FTS
