PETG-CF warnings

Bambu Filament and Accesories Filament
1

Not sure if that should go into this or the H2D (i have no other bambuprinter anymore).

Whenever i print PETG-CF i get a warning that i should not use the AMS, the filament is brittle. Warnings everywhere. Don’t use the HF nozzle, don’t use the AMS.

But on the filament buying page, i still see PETG-CF recommended, and as long as it’s a hardened steel nozzle, all should be good.

Anyone any insights? I am printing with the HF nozzle just fine, and i would assume that the firmware should be smart enough to control the flow based on nozzle/material combination correctly.

Frank

2

I print a lot with PETG-CF and other CF-reinforced materials. If I need to print multicolor or multimaterial (supports), I always use the AMS or AMS-HT without issues. However, you should be aware that CF causes accelerated wear on all components, including tubes and nozzles, and you’ll need to replace them sooner than usual. The same applies to glass fiber or luminescent additives.

In addition, you should keep in mind that some materials can be very brittle (e.g., PET-CF) and may cause clogs. You can solve this by making the PTFE guides wider and removing the top cover so that the PTFE entering the hotend goes in much straighter.

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3

That is not an answer to my question. I know this, and I keep this in mind. I appreciate the reminder though.

The “warning” from Bambu is just contradicting their own webpage when they sell me stuff. That’s the confusion i have.

4

I am just now seeing this message as well. I have ignored a few similar messages in the past and experienced immediate regret.
With that being said, it appears that the HF nozzles are not hardened steel and will wear prematurely.
So, unless you’re OK with more frequent nozzle jams and replacement, switch back to the clearly labeled Hardened Steel nozzles for CF/GF/Luminescent filaments. That is what I am going to do.

5

Hardened steel irrelevant, Bambu even sells tungsten high flow nozzles now… and they pretty much are marked compatible with all non-CF filaments…what makes a high flow nozzle? It creates two smaller channels inside the nozzle to increase surface area to melt plastic faster. But at the expense of making, it easier to clog and requiring a higher nozzle temp to ensure both channels flow… carbon fiber simply doesn’t play nice regardless of nozzle durability… it wants just one giant channel. For some reason, GF seems to not have the same issue…

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