I’ve been having non-stop issues with overhang issues with my X1 Carbon when printing ABS lately. I recently updated to the latest Orca slicer and tried a test print with default Generic ABS settings. I tried tweaking settings like flow ratio, part fan cooling levels, etc., but I’m still having issues. My part is especially bad at overhangs with supports.
Can someone take a look at my printed part and settings and suggest what to tweak next? I’d really appreciate it.
Below is the part before and after slicing:
These are pictures of the part where it failed. These areas are the supported overhangs near the top of the part:
These are the settings for the filament (Generic ABS) - any setting not screenshot has been left at their default configurations:
These are the print settings - any setting not screenshot has been left at their default configurations:
Slow way down, crank part fan to max, they might improve a little. But those overhangs are always going to be “ratty” unless you have an AMS and a dedicated support filament (Nylon works as a support material for ABS).
The only other think you can maybe do is break it up in to separate parts. Print the bottom and vertical rails as they are now, but print the top upside down on the build plate and then connect it with the rest afterwards.
You’re printing with ABS so you can use Acetone to bond the parts together, and you’ll end up with something that’d be as strong as if you printed it that way. Acetone dissolves the ABS surfaces and then they reharden when the Acetone evaporates. Done right, it’s stronger than any glue you might be tempted to use instead. 
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But those overhangs are always going to be “ratty”
What’s weird is that I never had any problem printing this piece with my Prusa S3+ with ABS and ASA. I’ve printed several of these exact pieces over the past few years, only had a problem with the X1, so it has to be some sort of setting. Maybe since the Prusa is a lot slower, maybe your suggestion about slowing down overhangs will do the trick.
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Speaking of slowing down overhangs - what max speed would you suggest? I have no clue where to start tbh
Start with whatever the max speed of the Prusa was. But remember, it’s not just speed, it’s also acceleration. The X1 can accelerate a lot harder, so it’ll still be going faster than the Prusa could, at least in some areas, even with a lower max speed. I’d reduce the accelerations to the same as the Prusa, too.
These changes will of course increase print time. But on the positive side, it ought to make the machine nearly silent while it prints.
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I slowed the bridging and overhang speeds way down to 25mm/s (what the prusa does for bridges) and while it’s a little better, I still have lots of issues with the overhangs. Something else must be the issue or this X1 Carbon was a very expensive waste!!!
What else could it be? Why does my prusa print so much better than this pos?
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In English below.
Bonjour.
Je viens de prendre connaissance de vos échanges.
Si cela peut vous aider, j’ai également une BambuLabs X1 Carbon.
J’ai dû réaliser pour des besoins en instrumentation scientifique une chambre de captation de gaz, qui ressemble en définitive à un seau.
Ses dimensions sont de l’ordre des 235 mm x 235 mm x 235 mm.
Je l’ai imprimé en ASA et ai eu le même type de problème de déformations.
Après quelque essais et recherche je suis parvenu à l’imprimer tout en conservant les données constructrices sur l’ASA et en ne modifiant que la température de chauffe du plateau, que j’ai élevée de 90°C à 110°C. et cela à fonctionner.
Il se peut qu’en modifiant également les paramètres de vitesse cela améliore l’impression, mais selon ce que j’ai pu observer, le maintien d’une température plus élevée permet de diminuer le retrait dû au refroidissement trop rapide.
Ce n’est bien entendu que mon observation et analyse.
Good morning.
I have just become aware of your discussions.
If it helps, I also have a BambuLabs X1 Carbon.
For scientific instrumentation purposes, I had to create a gas collection chamber, which ultimately resembles a bucket.
Its dimensions are around 235 mm x 235 mm x 235 mm.
I printed it in ASA and had the same type of warping problem.
After some tests and research I managed to print it while retaining the manufacturing data on the ASA and only modifying the heating temperature of the plate, which I raised from 90°C to 110°C. and it worked.
It is possible that also changing the speed settings will improve the print, but from what I have observed, maintaining a higher temperature helps reduce shrinkage due to cooling too quickly.
This is of course only my observation and analysis.
