Need some advice to clear up some printing

Bambu Lab H2 Series Troubleshooting
1

Recenlty started printing with PETG HF filament and HF nozzles. Everything is mostly good but some strange bad spots occur that I don’t know what to tweek to resolve. I printed two of these boxes at the same time and the issue is on the long side on one and the short side on the other. I then printed the narrower one alone and the exact same thing appears in the same place on the single print one as the multiprint one. The rest of the print is nearly perfect.

Printer H2D with Cyrogrip Frostbite bed.

Filatmet Bambu PETG HF dried to around 15%.

Nozzle is .6 HF

Any pointers would be greatly appreciated.

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2

might be pressure advance (K) 0.025 for my 230°C nozzle on petg hf

imo that’s not totally dry, better under stimate the hygrometer and also if you start to pull the spool out the AMS and your room is more than 50% humidity or you use the outer spool to print, I can grant you TPU and PETG rot in lesser than 24 hours.

3

I’m having similar issues with ABS. I can’t post about it because of community restrictions.

4

What community restrictions? Let me guess… did you just joined the forum recently? If you did, you are going to have to look around and read some other posts an stuff for a minute to increase your trust level, then you can start new topics.

5

Not sure how it could be wet filament and only affect a very specific spot on the part, in the same place, on multiple prints, in different orientations.

6

I get these on ABS as well. I’ve recently run the vision encoder plate through and haven’t had it occur again. I haven’t done long straits yet though.

7

The vision encoder is not going to solve the artifacts shown in the photos above.

It only improves the dimensional accuracy of the motion system.

1 Like
8

the wet is just about those tiny defects, not the huge mess that’s probably a sum of other things combined. you’re using 0.6 forgot my numbers

9

Yup, joined a couple of weeks ago. Still poking about until the muzzle is lifted and I can ask for help.:sweat_smile:

10

Whenever I’ve had defects like that, it was usually cooling related.

Try increasing your minimum layer time and maybe add a bit of fan speed along with it.

11

Every time that I have had a similar defect it seems the auxiliary fan was the culprit. Even on the A1, there is a corner where air tends to flow and cause little ripples.