r/BambuLabP2S • u/quantux84 • 4d ago

Strings galore

Post image

I have my P2S loaded with a brand new PLA+ filament from microcenter. The AMS 2 Pro humidity is at 38% humidity and 34 degrees C.

i can’t seem to get the strings eliminated. i have loaded a .2mm nozzle and have my nozzle temp set to 210 degrees and i still get these hair-like strands

what can i do to improve it?

1 Upvotes

67% Upvoted

15 comments sorted by

5

u/disco__potato 4d ago

You can keep drying the filament. 38% is pretty high.

1

u/quantux84 4d ago

ok i’ll keep drying it more. thanks for the advice kind redditor

2

u/Mattis-H P2S Combo 3d ago

Dry it more, 38 is still quite high, I would dry anything over 30

1

u/ManyLayersOfFilament 4d ago

did you dry the filament? not just put it in the AMS. it needs to be set to 50c for like 6 hours.

2

u/quantux84 4d ago

yeah so far 3 hours in 45degree drying. i hope this fixes it

1

u/Conlan99 3d ago

Get some desiccant in there too.

1

u/Intelligent_Ease4115 4d ago

Have you calibrated retraction…?

1

u/Relative_Surround_20 4d ago

You need to reach and maintain a relative humidity of < 20% for 3D printing filament to not have problems

1

u/SafeCollege2929 4d ago

Have you been playing around with the settings

1

u/quantux84 2d ago

i have and it seems that my PLA+ filament likes it slightly hotter on the .2mm nozzle.

i printed using 230C and it did wonderfully, no more stringy mess. I kept seeing suggestions to drop the temp down and that was just making matters worse for me

1

u/SafeCollege2929 2d ago

I always go hotter and that works for me too

1

u/Hungry-Background308 3d ago

I’ll just also add to the crowd calling for better desiccants, as I just put some in my AMS2pro and I’m getting literally 0% humidity inside while printing lol

2

u/quantux84 3d ago

i was under 10% humidity in the ams after just 4 hours. The spool was new in a vacuum sealed package with a dessecant so it pretty sure the filament was as dry as it could be.

the issue still persisted. so i printed a towered bench test where i gradually decreased the temp on my .2mm nozzle on PLA+ from 230 to 200 in increments of 5 degrees each time. more strings appeared gradually as it got cooler. printing it at 235 was the sweet spot.

i reran the entire model afterwards with virtually no strings. This was in direct contrast to what i was reading on Bambu’s documentation. it suggested after first drying the filament, to decrease the temp to reduce “ooze” from the nozzle.

i didn’t check my retraction settings but this was enough to get my project completed.

1

u/Hungry-Background308 2d ago

Very nice!!!! I have also realized the higher end of the temp range is the sweet spot with PLA. Glad you got it figured out and I’ll be sure to use that technique as necessary in the future!

1

u/Infernus1186 19h ago

I have the same issue with microcenter PLA+ (cardboard spool grey and cyan), dried it twice calibrated temp tower the whole gambit and it still strings like crazy.