"CF/GF filaments are hard and brittle...please use with caution"

Bambu Lab P1 Series
1

I am just trying a PETG-CF print for the first time and it pops up the below:

  1. CF/GF filaments are hard and brittle, It’s easy to break or get stuck in AMS, please use with caution
  2. The nozzle hardness required by the filament is higher than the default nozzle hardness of the printer. Please replace the hardened nozzle or filament, otherwise, the nozzle will be worn down or damaged.

I understand from a bit of searching that 2 can be ignored as I already have a hardened steel nozzle (it’s a shame the system doesn’t detect this).

But what am I suppose to action with 1? How do I “use with caution” exactly?

Also, I saw somewhere else it suggested that I should upgrade my extruder gear to hardened steel too, is that important? I couldn’t see any mention of that on the filament requirements page.

I have a P1S.

2

Hardened gears are advisable, it isn’t a bad upgrade overall anyhow. The CF will wear things the more you use it but generally not too rapidly, I’ve used 3kg through my AMS (two PLA and one PETG) on my X1C and there is some wear in PTFE.

It will test your routing, I’ve seen some mention about retraction codes when the filament gets stuck trying to pull back. This stuff feels stiff and is brittle, so drying is important in my opinion.

The best scenario would be to run hardened gear/nozzle and dry the spool before use (and store well).

3

Many thanks! I’ll probably upgrade anyway.

4

For #2 you can create a custom printer profile based off your system preset - at least in Orca Slicer and set the nozzle type:

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Also, within the printer menu (on the printer LCD itself), you can select the type of installed nozzle within the “Accessories” Menu. Make sure to set it the your hardned steel nozzle you’re using (0.4mm, etc.).

And yes, it is advisable to also use the hardened steel gear assembly.

As for #1, it is what it is. The best AMS compatibility is offered by Bambu CF Filaments (where the filament description explicitly states AMS compatibility). Other CF filaments will mostly work too, but just be aware that all CF filaments might break or get stuck. Also, they wear down the PTFE tubes within the AMS and printer a lot faster, increasing friction over time, causing the aforementioned issues.

1 Like
5

My first experience with PETG-CF was the print looked terrible. I guess I would need to tweak some settings or something. I had tweaked a few parameters and got things looking pretty good with PLA, but maybe these tweaks aren’t suited to PETG-CF.

There is no option within Bamboo Studio to set anything to “Hardened Steel” from what I can tell.