Asa layer adhesion problem

Bambu Lab H2 Series
1

Hi, I modeled the cap for the exhaust pipe of my house and printed it using ASA material. I’m facing a problem with poor layer adhesion. I can’t figure out why this is happening. The filament is brand new, freshly opened Elegoo ASA White.

This photo is without filament drying, where you can see how the layers separate — that also happens when I press them together and they snap or crack.

Here are the prints after drying the filament. The surface looks better, but the adhesion hasn’t improved, and I can’t figure out what the issue is. I also tried printing slower at 40 mm/s, but it still didn’t help. Now I don’t know whether the problem is with the filament or the printer.
https://drive.google.com/file/d/1ItdxgysFOhqbG-LQdbIlFXVabDooCztj/view?usp=sharing, https://drive.google.com/file/d/1MZ6FGGwK2CulrmwKxiAH8KTnriu_mc99/view?usp=sharing, https://drive.google.com/file/d/1cePOVR7yoeu47jYrBuI7wWMnVe546aSG/view?usp=sharing, https://drive.google.com/file/d/1wvcbSCKqzRj7149qSPkyuiBaWtZ_pwYL/view?usp=sharing
Print file
150.3mf (226,8 KB)

2

I would try turning up the hot end temp by 10-15c.

1 Like
3

A couple things that I noticed:

  1. Your model was not exported in high resolution. The geometry is quite rough and jagged.
    2. You might want to use Arachne to avoid generating gap infills
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Gap infills are pretty bad for printing as they create very uneven extrusion. This could be the main issue of your print.

  1. Nozzle temp for Generic ASA is too low I think, it’s only giving 260C. Most ASA I work with prints better at 270C.
  2. Your model is clearly having some rather large shrinkage deformation. If all 3 suggestions above doesn’t help, consider switch to ASA-CF or other CF/GF filaments.
4

Thanks for both of your replies.
I modeled the part myself in Fusion360. It’s true that I exported it as an STL and not through the 3D Print option, but until now I never had a problem with that. Honestly, I’m curious — how did you come to the conclusion that the issue might be with the export quality? Could you please explain it to me so that I can assess it myself in the future?

fsafas
fsafas1810×784 201 KB

This is for now.
The problem I have now is how to export this quality directly into an STL file in Fusion, and not just into a project for Bambu — but that’s another topic.
I tried printing it with the adjustments you suggested, and I’m attaching the file I used for printing. Let’s see how it turns out.
150.3mf (2,9 MB)

5

Well, after printing it’s better, but the layer adhesion is still not good. Now only 3 lines/layers break, the others are fine. Does anybody have any idea what could be the cause?

6

0.24mm layer height. you want layer adhesion then you better stick to <=0.2mm

7

123
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Yes that was my fold i update model i thing this can help but take more filament well i see .

8

Try exporting from Fusion360 using the STEP format. Step files can contain curves whereas STLs contain only triangles.

9

You have some significant overhangs in the corners. This will reduce layer adhesion because there is less overlap between layers. Can you make the angle steeper in the corners? You could also try using supports if you cannot make the angle steeper.