What I display here, my organic prints, are just for fun
Orientation for mechanical parts is just as if not more important than the settings
I see a lot of failed mechanical parts that are due to them being orientated on the plate the same way as a bed slinger
Unfortunately trying to find the perfect path has either not been solved yet or is some kind of closely gaurded secret
We don’t know yet where the limits are for the XYZ axis speeds, accelerations and accuracy but what immediately helped me was breaking the habit of thinking along the lines of bed slingers when I need to look at it as a core XY
I actually think the Voron guys would have an easier time finding the limits on the Bambu printers but to me it feels like the Chevy vs Ford gangs butting heads talking s**t lol
You ever get this issue worked out? I recently ran a fantastic looking print with PETG. The only issue…the deep drag/scratch at the top of all the overhang radius. But only at the smallest part of the radius.
I’m having issues with seams getting torn open and it looks a little bit like your issue. I’ve had some luck turning down the outer wall acceleration. I was able to get the seam to stop ripping at 300 mm/s^2. Turning the acceleration down has revealed some ringing on that face now, but at least the wall is extruded all the way around.
That is EXACTLY the same issue I have! I post the first ever print again I did some weeks ago (top was printed on the Bambulab PETG; bottom was printed on ultimaker original with PLA):
I mean the probability I’m not the only one having these issues was very high, but it’s better to have evidence.
It’s almost 1 week since I got the last message from Bambulab! So far I did what they told me to. I printed some files they created, but it was even worse.
I can’t seem to figure out what I need to adjust to fix the issue since the rest of the print looks perfect. It’s like it has nothing to adhere to at the top of the radius so it drags it away. I’m nowhere near an expert so I’m lost on the matter. Following your post closely tho.
Well, this whole thread is about finding out how to solve the issue… Bambulab is working on it and I should get an answer tomorrow. Last question was, which slicing engine I use. I think it has to be some kind of slicer bug.
Try turning down outer wall speeds. I have my outer wall acceleration turned all the way down to 200 mm/s^2 and my outer wall speed set to 60 mm/s. If you see any improvement you can try creeping the values back up to see where the issue becomes apparent.
I’m not apologizing for Bambu, just trying to help. I’m in the same boat here – realizing that this printer is nowhere near capable of the advertised speeds when printing mechanical parts in PETG. This is a fast printer for making superhero busts out of PLA, it is not the engineering-grade prototyping machine that I thought I was buying.
Let’s see what they can fix with software. Since apart of the artefacts PETG parts look very good, even at high speeds, I still think it must be possible to fix it with a software update. Besides the current issues I do not regret I decided to get the Bambulab instead of the Prusa MK3S+. I had a look at the raise 3d machines and compared to those machines the bambulab is cheap. I knew I bought a first generation product. I chose accepting some flaws rather than waiting for another 1 or 2 years until everything is fixed.
So far I was really patient. But I did everything they told me to do without success at all.
I told them I really consider returning the printer if they don’t solve the issue. At the moment it’s a PLA only printer, since the PETG quality is very very poor!
If it’s a software only issue, there must be plenty of other users with the same issue. This seems not to be the case.
If it is related to hardware as well, I could ask for a replacement. I don’t intend to return the printer. It’s a fantastic machine with some smaller issues which need to be resolved.
