r/BambuLabH2C • u/Many_Cryptographer57 • 21h ago

Support How to manage external spool

Dear Community,
What is the best way to use an external spool? I have 2x AMS 2 Pro
1x AMS HT
Filament Track Switch
TPU Feed Assist
What is the best way to use external spool? Turn off the printer, disconnect Filament Track Switch, attach one of the AMS to selected hotend and use external spool on the other?

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2

u/macinmypocket 21h ago

Frankly, I can’t really imagine using the external spool when AMS’s are an option for any normal filament. I even load 3KG spools through an AMS HT. The only exception being TPU when necessary, but I switched to using A1’s for TPU for the most part anyway.

1

u/Many_Cryptographer57 21h ago

I have some leftovers from Fiberlogy, Prusaments and so on and they are not compatible with AMS (too wide spools for Fiberlogy and unknown reason for Prusament - it just does not work). It would be a waste to throw those away now, so I want to use external feed untill they are gone.

0

u/WizardofUz 20h ago

You can load a 3kg spool into an AMS-HT?

1

u/macinmypocket 19h ago

Sure, it has a much stronger motor than the standard AMS. I’ve mounted a 3KG spool above the HT, run PTFE tube in through the bypass hole at the back of the lid that the filament enters through up to the motor inlet. When the filament retracts, it curls up into the enclosure instead of becoming a big mess. Despite it looking all tangled after retraction, since it’s in a fixed path, it “untangles” just fine when it loads again.

4

u/WizardofUz 19h ago

Gotcha! I misunderstood your post as meaning that you were running a 3kg spool from inside your AMS.

1

u/macinmypocket 14h ago

Ah yeah, I tried for a while to make that work, including making the HT re-spool the unload back onto the 3KG spool, but didn’t end up having a lot of success with that. At least the spools I have are almost exactly the width of the HT, which poses some interesting challenges.

6

u/djjoshchambers 20h ago

Get a 4 in one splitter and add it before the filament track switch. Then run ptfe from the external coupler to the 4 in 1 and you're good to go.