Layers do not hold together
Hiho,
when I print with PETG the layers of my printed parts dont hold together. Especially the hull lines are easily to remove.
On the left picture the intended printed part is to see. The right one shows the same part, which was tested for its resilience by brake it in the middle. After the first preassure there were a crunshing sound to hear out of the inside of the part. The first hull lines were detaching from the object. After the very easy brake all hull lines (nearly every for its own) was detached from the part itself. The complete layers I could easily separate with my finger nails.
I printed the same part with PLA (upper picture). This one is brakeable, too, sure. But this was much more resistant and not all hull lines are removeable. Even the Layers cant be separated.
Has someone any ideas why the PETG part is such much more instable?
RE: Layers do not hold together
Like your other posts for this exact same problem: increase the print temp to get better inter-layer adhesion.
RE: Layers do not hold together
[...] Has someone any ideas why the PETG part is such much more instable?
@tim-m30's got it: Heat is your friend with PETG. Turn off the part cooling fan. If that's not sufficient, increase printing temps. It will probably never looks as nice as PLA but it should be STRONG.
RE: Layers do not hold together
Okay, thanks for this hints. I will test it this afternoon.
But as further information: The print of PETG already was working very fine and I had prints with very good results.
I dont want to make it to a science to get the right printer settings, so I only use the prusa printer settings for the corresponding materials. These were always quite good settings for me. But now, suddenly (perhaps because of the MK3s upgrade, but I am not such sure to say it as a fact), these settings should not work anymore? How could this be?
RE: Layers do not hold together
Before I upgraded my MK3 I was able to use the Prusament PETG profile to print with Amazon PETG. After updating to the 3S, however, it was making a total mess and had to tweak the settings (cooler and less fan).
So yes the upgrade may have something to do with it.
RE: Layers do not hold together
No profiles works out of the box, all filament is different.
Slower printing could help,
more heat could help
And the lines direction you print is important, were comes the pressure on the lines you print.
One direction will be weak, printed in other direction will be stronger.
RE: Layers do not hold together
Thanks for your ideas!
Till now i have checked all of them in different ways, but every time it did not get better.
I have printed several objects (this one shown above, and some other objects, too) with different speeds, up to 30mm/s. The result was worse than before.
Even with different print temperatures the same: My highest temperature was 260°C (nozzle) and the result only got worse.
The deactivated fan had no effect, too.
The combination of every setting could not make it better, too.
And several tries with different infills, .... just the same.
I have the MK3S which ran quite good, some weeks ago, so the assumption is close that something arround the upgrade from MK3 to MK3S made something worse.
I have the Firmware 3.7.0 and will check for the next prints the new one 3.7.1.
Additional i have the MMU2(S) but although it is installed, till now I could not print anything in multi material because i first have to clarify the issues I currently have.
And sure, little adaptations to make the result even more better are okay. But in the past i could print out of the box with the prusa profiles and had results which were perfekt for my further plans.
And yes, you can make it better when you think about the directons to print. But the thinnest wall thickness of the above shown object is 4mm. I have already printed things in PETG with 2mm and they were not brakeable. You only could bend it, okay, because of the 2mm, but they did not burst in such crunshy way.
@gnat: I also have amazon PETG which I can print only more worse to print. When I print with this the object cant be finished at all. After a clowd of filament arises the nozzle loses contact to the object and only increases its clowd. Have you changed your settings this way that you now are able to print the amazon PETG?
RE: Layers do not hold together
Good and bad news.
After a factory reset I can now print the object shown above with deactivated fan. The result is very good.
So, thanks for this tip, for this object it works. But when i have to print overhang and bridges, the results are very bad. I tried several settings, but nothing could lead to success. I will make a new thread for this topic, but this one is solved.
Thanks for your help!
RE: Layers do not hold together
This thread is not solved because you are still having problems. You really need to think about what it is you are trying to do, and write a concise description of the issue so people can actually help rather than guess what it is you need help with.
RE: Layers do not hold together
This thread is about not sticking layers. Now after trying one of your tips, I can print with my materials PETG and PLA strong solid objects.
The solution leads to a new problem: No good bridging behaviour with PETG. This has nothing to do with not sticking layers.
So in my opinion this thread is solved. Now I'm looking for a Thread with a similar problem in the forum. If I do not find anything, I will open a new thread.
Or is a such problem-oriented topics opening unusual for this forum? In this case I can continue here, no problem.