Trying to dial in PETG-CF and 0.6mm Nozzle

[InsufficientSleep]

Hi, pretty new to 3D printing. I’m trying to print with the PETG-CF filament and I just can’t get it dialed in. I have read pretty much all the posts here and on Reddit but I just can’t get the Bambu test cube to come out perfectly with the 0.6mm nozzle. The 3DBenchy comes out great though, maybe the cube is a bad test? My Filament is dried for 12h at 65°C / 149°F and the RH in the AMS is at 8%. The flow rate and K-factor was calibrated twice with similar results. After 2 days of testing I lost track of my settings and started a spreadsheet. I’ll try to copy it into the post as a table. Here is also a picture of the test cube and the 3DBenchy. Any pointers would be much appreciated and helpful.

Edit: Was in a rush to post before I went to work. The filament is the Bambu PETG-CF

Column 1	Column 2	Column 3	Column 4	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z	AA	AB	AC	AD	AE	AF	AG	AH	AI
Preset	Test model	Filament and RH%	Nozzle Size mm	Layer Height mm	Calibrated K-Factor	Max Volumetric Speed mm³/s	Calibrated Flow Rate	Nozzle Temp °F	Min fan speed threshold % and layer time	Max fan speed threshold % and layer time	Cooling overhang threshold	Keep fan always on	Fan Speed For Overhangs %	Initial layer speed mm/s	Initial layer infill speed mm/s	Outer wall speed mm/s	Inner wall Speed mm/s	Sparse infill speed mm/s	Internal solid infill speed mm/s	Top Surface speed mm/s	Bridge speed mm/s	Gap infill mm/s	Overhang speed mm/s 10%	Overhang speed mm/s 25%	Overhang speed mm/s 50%	Overhang speed mm/s 75%	Overhang speed mm/s 100%	Support mm/s	Support interface mm/s	Sparse infill pattern	Sparse infill density %	Result notes	Print No.	Additional Notes
Default 0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	255	5% - 30s	40% - 6s	10%	Yes	100	50	105	200	300	350	250	200	50	250	0	50	30	10	10	150	80	Grid	15	Sagging on overhangs	1	Standard profile no changes to it besides flow calibration and K-factor
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	245	5% - 30s	40% - 6s	10%	Yes	100	50	105	200	300	350	250	200	50	250	0	50	30	10	10	150	80	Grid	15	Some sagging on overhangs	2
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	265	5% - 30s	40% - 6s	10%	Yes	100	50	105	200	300	350	250	200	50	250	0	50	30	10	10	150	80	Grid	15	Some sagging on overhangs	3
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	255	40% - 30s	90% - 6s	10%	Yes	100	50	105	200	300	350	250	200	50	250	0	50	30	10	10	150	80	Grid	15	Minor sagging on overhangs	4	The best of the 9 first prints
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	255	40% - 30s	90% - 6s	10%	Yes	100	50	105	200	300	350	250	200	50	250	0	20	20	10	10	150	80	Grid	15	Some sagging on overhangs, 4 was better.	5
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	255	40% - 20s	70% - 6s	10%	Yes	100	50	105	200	300	350	250	200	50	250	0	20	20	10	10	150	80	Grid	15	Minor sagging, similar to 4	6
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	245	40% - 20s	70% - 6s	10%	Yes	100	50	105	200	300	350	250	200	50	250	0	20	20	10	10	150	80	Grid	15	Sagging	7
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	260	40% - 20s	70% - 6s	10%	Yes	100	50	105	200	300	350	250	200	50	250	0	20	20	10	10	150	80	Grid	15	Sag on overhangs	8
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	255	40% - 30s	90% - 6s	10%	Yes	100	50	105	200	300	350	250	200	50	250	0	20	20	10	10	150	80	Grid	15	Sag on overhangs	9
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube + 3DBenchy	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	255	40% - 30s	90% - 6s	10%	Yes	100	50	105	200	300	350	250	200	50	250	0	50	30	10	10	150	80	Grid	15	Bambu cube got some sag , 3Dbenchy close to perfect	10	Print 4 settings again to compare against the previous no.4
Default 0.24mm Balanced Strength @BBL H2D 0.6 nozzle	Bambu Cube + 3DBenchy	Bambu Petg-CF 9%RH	0.6	0.24	0.039	11.5	0.95	255	40% - 30s	90% - 6s	25%	Yes	100	50	105	200	300	350	250	200	50	250	0	50	30	10	10	150	80	Grid	15	The Bambu cube was slightly better and the 3Dbenchy was good.	11
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube + 3DBenchy	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	255	40% - 20s	90% - 6s	25%	Yes	90	50	105	150	200	200	200	150	50	150	0	50	30	10	10	100	50	Triangles	20	The Bambu cube was saggy but the 3Dbenchy was good.	12	slowed down speeds
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube + 3DBenchy	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	255	40% - 30s	90% - 6s	10%	Yes	100	50	105	200	300	350	250	200	30	250	0	50	30	10	10	150	80	Grid	15	cube little saggy but the 3Dbenchy is fine	13	Same as print 4 but lower bridge speed
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	255	40% - 30s	90% - 6s	10%	Yes	100	50	105	200	300	350	250	200	20	250	0	50	30	10	10	150	80	Grid	15	Pretty good. Slightly saggy	14
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.20	0.039	11.5	0.95	255	40% - 30s	90% - 6s	10%	Yes	100	50	105	200	300	350	250	200	20	250	0	50	30	10	10	150	80	Grid	15	Pretty good. Slightly saggy	15
0.18mm Balanced Quality @BBL H2D 0.6 nozzle	Bambu Cube	Bambu Petg-CF 9%RH	0.6	0.18	0.039	11.5	0.95	255	40% - 30s	90% - 6s	10%	Yes	100	50	105	200	300	350	250	200	20	250	0	20	20	10	10	150	80	Grid	15	Slightly more saggy than 15	16

[Bullocks]

I’m not sure about bambus cfpetg, but it looks like in every single trial you are cranking that hog rather fast.

Try 40mm/s outer walls, 60-80mm/s other stuff, fast travels. Do a pressure advance calibration at the outer wall speed.

Cfpetg is still petg and likes to dribble/ooze so I also recommend capping minimum print speed of 20ish - even on overhang, it doesn’t perform well under very low extrusion rates (for me)

[L0rdS474n]

In my experience, 12 hours of drying wasn’t enough — I had to dry it for 24 hours to get perfect prints. I used my AMS HT for some spools and my EIBOS dryer for others.

[InsufficientSleep]

Thanks, I’ll try to slow everything down for the next tests

[InsufficientSleep]

Thanks. Guess I’m giving it another drying cycle tonight

[Bullocks]

that site link to orca is adware

the official site is linked on their github page

[InsufficientSleep]

What link? I don’t see any links here

[InsufficientSleep]

So I dried the filament for another 12 hours as suggested by @L0rdS474n. Then I cranked down the speeds as suggested by @Bullocks.
There are still some sagging on one of the sides but way better.
Pictures of settings and results. Everything else had the default 0.18mm profile settings.

Going use this as a base line for further testing.

[Bullocks]

Sorry, some ad-bot replied there but has since been deleted.

Looking pretty good. The finish of CFPETG is always so luxurious

[L0rdS474n]

Now it’s fine tuning time, nice to see it got better.

[InsufficientSleep]

After a manual calibration the new K-value ended up lower than the value from the automatic calibration. K0.039 (automatic) to K0.020 (manual).
I printed two new cubes with the slow settings and the sides turned out good but the overhang / bridge in the middle got slightly worse on both of them.

Getting closer… I think…

[InsufficientSleep]

I tried a model with a longer bridge gap today and it looks like my filament doesn’t like to bridge too far with the current setting. I was using the slowed down settings from earlier in this post. Any pointers would be helpful. I feel like I’m already using a loot of cooling and the speed is really slow compared to the print profile from Bambu. Maybe Bambu’s PETG-CF can’t do any better?

[L0rdS474n]

It can, I’m actually printing it right now with zero issues — though using a 0.4 mm nozzle.

Feel free to share the model you printed, and I can run it on my setup to compare.

[InsufficientSleep]

The models I have been test printing comes with the Bambu studio. Just right click and add model. My main model which is a full size helmet shell printed nice with the 0.4mm nozzle until it clogged and messed up my prints. The 0.4mm nozzle have done that twice for me now usually around 30h into the print so that’s why I’m trying out the 0.6mm nozzle. Think I’m gonna go back to the standard filament profile but increase the cooling and add more supports for everything.

[L0rdS474n]

Ah, I did clog one 0.4 HF nozzle while printing PETG-CF. I’m aware it’s not officially recommended, but it has worked fine for me with all colors—except red, which caused a severe clog after the print. Since there was still some flow through the nozzle, I ran about 30 cm of cleaning filament through at 350 °C, and the clog cleared completely.

I’ll start a test print with the 0.6 nozzles once the current job finishes.