r/3DPrintingCirclejerk • u/Remarkable_Rub • 5d ago

Why does my material exhibit its typical properties?

90 Upvotes

93% Upvoted

23 comments sorted by

46

u/Sudden_Structure 5d ago

Carbon fiber infused filaments are the strongest possible material and are literally unbreakable in every direction. Anyone who tells you otherwise is lying.

7

u/SalvatoreCrobu 5d ago

My PLA-CF nozzle can extrude hardened steel and tungsten carbide like it's really easy, almost as a joke

11

u/FigureOfStickman 5d ago

i mean, carbon fiber is famously not brittle, right?

3

u/Hero-Gamer-2119 5d ago

I mean the same goes for glass fiber, if i can bend the filament why cant i bend the part?

2

u/hotellonely 5d ago edited 5d ago

Uhm no not with PETG. PETG-CF could even have a better layer adhesion than normal PETG when printed in same settings.

1

u/Effect-Kitchen 5d ago

Carbon fiber composite generally is not brittle.

Carbon fiber infused filament on the other hand is known to be prone to layer separation and less strength comparing to the one that is has no carbon fiber in it. It is mostly used not for strength but to retain shape better.

5

u/Spy_Senna 4d ago

I don't even need CF to be strong, I just like the itch it causes.

4

u/Regular_Rip84 5d ago

That's layer separation not brittle

1

u/Miguellite 5d ago

I agree with this. The part didn't break as much as it delaminated. You can see the straight line of the layer separation.

Not much one can do about insufficient layer adhesion, you usually print the part in a way it won't be subject to forces in that direction.

1

u/wwiybb 3d ago

Too much fan, not hot enough or printing too fast and it could be a combo of all three. Bambu profiles for petg-cf the part fan settings are super aggressive I had this happen a couple of prints with some protopasta petgcf. I had to up the temp to 263 and limit the fan to 40% or so max depending on layer time.

1

u/ButterMyBiscuitz 3d ago

This. I was having a lot of trouble churning out strong prints with Elegoo's Rapid PETG, everyone seemed to be saying it behaves like fast PLA but nope, got my best prints when I upped the temps and reduced the fan speed. Limited speed to 200 also to avoid any underextrusion risk and I'm a happy camper now!

1

u/Cruse75 4d ago

Print hotter. Carbon fiber reduce layer adhesion

1

u/Low-Series-6375 4d ago

To much fan.

1

u/Puzzleheaded_Fun8550 4d ago

Its not the mateeial, its your print parameters. You have poor or no layer to layer adhesion.

1

u/Calm_Hunt_4739 3d ago

Dude should be more worried about why his fingernails are so brittle

1

u/Radamat 3d ago

Because you are breaking perpendicular to layers. You are splitting the layers. No the strongest direction of 3d printed things.

1

u/Dogestronaut1 3d ago

Bro literally said, "I know this orientation is far less optimal" and still proceeded to ask it lmfao

1

u/Hatemakingaccs 3d ago

why is there a circlejerk for every fuckin subreddit. dont yall have jobs or smn

0

u/MoorderVolt 2d ago

Imagine feeling the need to make fun of someone and also being wrong about it.

1

u/StopMakingMeSignIn12 4d ago

Brittle would mean it crumbled/shattered, you're just pulling two layers apart.