I noticed that it does not allow me to load TPU using the described method in the documentation by bypassing the default hubs when I installed the filament track switch. Why is that, I completely bypass all of it by going directly into the PTFE tube to the nozzle…?!? Kinda annoying to unplug it each time I want wo print from external wheter it is TPU or another filament. Just deactivate the FTS whe nloading from external spool should work or am I missing something?
Which printer is “it?” Which nozzle are you trying to print to? What TPU hardness is your filament? What error is displayed?
You left a lot of helpful information out about your setup.
Is your printer the H2C? You chose the H series category. So I assume not the X2D.
If it isn’t either of these, the issue is likely a lack of compatibility currently until new firmware is available.
Yes I mean H2C but should be for all printers which have track switch compatibility right now. TPU hardness shouldn’t play any role here because it has nothing to do with the printer not loading any filament from external when track switch is installed. Bot left or right nozzle cannot load any filament from external on my side when FTS is installed. I assume lack of compatibility too but its annoying anyway.
Yeah this is clearly a software limitation, and not for any good reason. Presumably they will fix this. I do hope “filament track switching” becomes a thing so that Bambu invests in both more optimized software, and the actual hardware we need (2-output AMS units, 8-to-2 FTS, and such).
it also tells you to cold pull if you try to print tpu. for someone running half a dozen machines and tpu exclusively, id like the option to opt out of the notification. its slowing down my production!
I really want them to fix this. I bought FTS for my H2C so I don’t have to change the AMS2 mounted on the right nozzle to the left nozzle every time I’m printing 85A TPU. The TPU is mounted directly on the right nozzle so there is no reason for them to prevent this. I understand the reason why they are blocking external spool using FTS but TPU use case needs to be an exception since it’s not going through FTS.
I get the same notification when trying to print Tpu 95A HF with my X2D through the tpu feed assist module, it’s so annoying.
If you’re saying the machine is denying you the ability to do it, you can workaround the software by just lying to it and say its pla. Copypaste the TPU profile’s everything and just rename it and select type PLA, and see what happens.
You didnt mention brand of tpu but if your TPU is wavy and irregular and looks like curly hair – it wont go thru tubes nicely, and will likely jam everything, so only do this with smoothwalled TPU filament.
I run 2x AMS2, the FTS and TPU feed assist on a H2C to print PLA supports with TPU.
The FTS has a default filament path with no power applied.
My current TPU workflow is to disconnect just the control wiring for the FTS to trick the printer into believing there is no FTS. Run/plumb the TPU Assist as advertised.
My AMS filaments are loaded such that the PLA box follows the default FTS path to the Left nozzle. The PLA is only support so I’m only concerned about auto-refill working correctly and one AMS should cover that. You do need to manually configure and chose the external filament roll for the right hand extruder.
Plugging the FTS back in and running the FTS auto config tool puts everything back to normal for full dual AMS functionality.
I did find a neat print to allow hanging a 4to1 coupler on the cable chain. So no need to touch the PTFE tubes for TPU work and the TPU assist can stay plumbed in.
Disconnecting the FTS also means when using PLA or any other material as a support interface layer, that you have to load the filament as an external spool; In my case taking off the PTFE tube before the filament buffer and manually feeding it from the external spool holder…
They should add an update to be able to print or at least bypass a warning message when having the FTS connected and let us use the fts for the secondary nozzle.
Same here but on a X2D, came across this limitation, and hope it will be fixed soon. Having to physically disconnect the 6-pin cable especially with tight cable management is frustrating, and unplugging connectors repeatedly risks wear and tear on the ports over time, not to mention all the other good points made here in the threat.
X2D user here also. First post
I just setup and ran my first TPU assist powered print. I didn’t read the Forum until after I had self-solved the problem of removing the Filament Track Switcher cable. I definitely want to see a firmware update that allows the track switcher to remain in its physical configuration on the printer, while disabling filament feed through, in my case, the left nozzle path of the FTS. That would allow normal operation to resume when TPU assist use ends. Seems like a very small effort for Bambu considering the reputation the FTS is getting over feed resistance. On that note, has anyone gotten an FTS that doesn’t cause these errors?
Cut a power track on the FTS board, put a switch
That’s actually a good short term workaround, I hadn’t even considered hardware mod.
Still, I want to be able to use the track switch to route filament to the bowden extruder while the TPU assist is on the left. Does the track switch default one way or another when powered off?
No it stays where it was
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Another H2C user here with one AMS, one AMS HT, and the FTS. I need to use the external spool for CF filament. Please add support for this in the firmware. It’s frustrating to have to unplug cables before every print!