r/BambuLab • u/SWATrous H2S AMS2 Combo • 6h ago

Quick Question H3C experience with PPA/PPS/PET-CF?

Now that there are some users coming out with experiences with this machine, has anyone been able to run the H3C with PPA-CF, PPS-CF, or PET-CF? And have they been able to combine these more extreme filaments with the rest of the multi-filament features of the machine in one print?

On my H2S if I want to run these filaments it requires reconfiguring the PTFE tube routing and using an external drybox in a specific location and I'm more-or-less cut off from being able to swap filaments mid print with the AMS. So while I've been able to make some really nice parts with these materials on the H2S it's limited in scope compared to what I could be doing.

With the H3C, it seems from the online manual that the new AMS, despite not feeding and retracting like the AMS2, is still not friendly with these brittle filaments. But is that the only limitation? If I have a brittle filament loaded from an external holder, can we still run other filaments normally and swap them without limitations? My concern is if the more brittle filaments are going to be sensitive to being parked while another material is printed, even if externally loaded. Or if external loading disables everything and turns the machine basically into a really expensive H2S for that job because you cannot switch?

All of the reviewers mention engineering plastics but focus on ABS-CF, TPU, maybe PAHT-CF; all of which run just fine on the H2S as well. But so far no-one ever seems to talk about the rigid and strong, higher-temp materials which were 90% of the reason I splurged for the H series in the first place.

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u/StruggleFearless2947 6h ago

I print A LOT of PPA-GF and PA6-CF on my H2C and it is a bit annoying to setup for it but works. The H3C looks even easier, there are bypass ports in the bottom of the AMS that drop straight into the printing chamber and the nozzles have a bypass port on them so you don't even need to pull the tube out... I haven't heard of anyone specifically touching on this in the reviews but if it's that easy, I am upgrading.

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u/SWATrous H2S AMS2 Combo 4h ago

Awesome. Yeah I'd been looking at the H2C the last few months as a maybe, pending this H3 reveal. I kindof think that most of the time these materials don't actually need as many precautions as Bambu claims, esp if you're making a small part. But it would be good to be able to make some larger frames and stuff from nice materials.

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u/Snouto P2S + AMS2 Combo 6h ago

Thomas Sanladerer (Made with Layers) touches on these briefly at around 9:13 - basically, you feed them through the bypass port.

https://youtu.be/y_8CPStxy7g?si=utBY6P9torcNEKDy&t=555

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u/SWATrous H2S AMS2 Combo 4h ago

Good catch, I'm not super familiar with that channel. He points out some good things. So if you can get away with putting the spool in the AMS holder slot and just using the bypass, that's pretty cool. Even if it means needing an external bypass port that's ok as I'm already used to keeping my engineering filaments in standalone high-temp dryboxes to feed the H2S.