Hi Guys
how can i fix this surface?
Those artifacts appear to be rather small. Did they show up on the actual print? I ask because we often see posts here where someone sees something in the sliced window only to have not tried to print it and discover that what was on the screen was far different in the real world.
I would not be surprised if the actual print did not reveal these artifacts.
However, a simple test that you can perform. Take the model, cut it down to size or lower it below the build plate in the slicer. This will create a much shorter model and save time to print without wasting a whole print’s worth of filament.
Do the images show a slight misalignment in the rendering / studio`s slicer / model ?
I printed this and there are lines on the surface. I will share when i get home.
There is no such defect in the drawing but the slicing is wrong or I don’t know why
Based on those photos and the clear screengrab(thanks for posting details 
) I am leaning towards a defect in the STL file.
You wouldn’t by chance mind uploading the 3MF? I’ll load it into my slicer to see if I can reproduce the error at my end.
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How was this model made?
If possible, can it be exported from the authoring software as a STEP (.stp) file? This type of file contains solid, mathematically-defined objects. When you open STEP files in BambuStudio it does the conversion to tessellated triangle surfaces. It will often do a better/different job than if you import an STL file - these are pre-tessllated.
Vase mode.3mf (6.1 MB)
I drew on the rhino and saved it as an stl file. Do you mean to say that I should save it as a step file?
I want to upload stl and gcode file but i can’t.
I shared the file as 3mf, you can export it as stl from the file.
Edit: I tried it as step file but same result
Thanks for uploading that file.
Based on your follow up posts, it seems like we are chasing more than one issue.
While I am not mad at you, this is what can be very frustrating for the community or any other person trying to help a user analyze a solution. That being, “keeping the user focused on one problem at a time”. While this may not have been your intent or you may not realize it, I cannot stress enough how much filament and time I see wasted chasing two or more issues at once.
- Troubleshooting 101: Change one and only one, variable at a time!
You have two issues as I see it:
- Why is your system not rendering the model on-screen correctly?
- Why are you getting undesirable artifacts?(That’s the easier one)
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Analysis of the 3MF file and model.
I can confirm that the model rendered flawlessly in my environment. There are none of the artifacts in the model that your original image displayed so I can’t reproduce this image. See my tests below.
Testing methodology
I conducted tests by exporting the model as STL and also used your original 3MF files and opening them in various applications to analyze any visual artifacts. Here’s the breakdown of the tests:
- Exported the model as an STL file and opened it in:
- 3D Viewer
- 3D Paint
- 3D Builder
- All these applications, using the Microsoft Windows rendering engine (also utilized by Bambu Studio and Orca Slicers), showed no artifacts.
- Repeated the same test using the 3MF file, with similar results—no artifacts observed.
Click on this high resolution image to zoom in.
Oddities in the model
What I was able to determine that is odd about your 3MF is that you have modifier in the model that does not appear to do anything. What was it’s purpose?
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The big question:
What computer hardware are you running on? More specifically:
- What GPU? Most important question!!!
- What Processor?
- How much system memory?
- What OS?
- What version of the slicer are you using?
I ask these questions because either the STL model is corrupt, the 3MF file you uploaded is not the same one shown in the initial post, or, as unlikely as it may seem, there is some kind of incompatibility in your system causing rendering errors in the output algorithm.
Have you tried to render this file on another computer?
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Problem #2–Undesirable lines
These lines are classic symptoms of differences in filament flow due to there being more material at the bottom layer thus shrinking at different rates. This can be remedied through manually calibrating your filament and fine tuning:
- Calibration:
- Flow rate
- Max Flow Rate
- Find Optimum Filament Temperature via Temp Tower
I couldn’t fully understand your comments. My goal was to reach a solution, and after reading the comment about whether the STL file would give good or bad results, I decided to try it with the STEP file extension. I didn’t understand how this leads to different topics. I apologize if I was misunderstood. Also, since my English is not at an advanced level, I sometimes struggle to express myself clearly. Please excuse me again.
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Analysis
As you can see in the drawing, there seems to be no problem, but when I slice the file, I get this kind of image. -
Strange aspects of the model
If you look at the bottom of the model, I intended to create a hole, so I placed a second part as a negative piece there. You can slice the file and take a look at the bottom. -
Big question
I tried it on two different computers with the same results:
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Radeon Tuf rx 6800 16 GB
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Intel i5 12400F 2.5GHz 18MB
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16GB RAM
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Win 10
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Bambu Studio 1.10.1.50
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GTX 1060 6 GB
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Intel i7-5820k
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Win 10
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Bambu Studio 1.10.1.50
Problem 2#:
If these lines didn’t appear in Bambu Studio, I would have thought the issue was related to flow rate, but the program already shows those lines. I don’t understand why it’s doing this, as there are no such lines or imperfections in the drawing.
Again, if I was misunderstood, I apologize. My goal was simply to figure out why there is a flaw in such a simple surface.
Don’t sweat it. Forum communications is not exactly a science either. 
I also went back through the thread and realized that I overlooked the fact that this version of the 3MF was derived from a STEP file. That was an important diagnostic step.
Thanks for supplying the computer configurations. The fact that your running on both an NVIDEA and AMD graphics platform and are still seeing artifacts on both at least allows us to rule out underlying hardware rendering as a root cause.
Focusing back on the model at hand. I ran this in both Bambu Studio 1.10 and Orca Slicer 2.2. Bambu Studio did complain that the file was produced in a beta version but which I would normally not consider it relevant but I mention it for the sake of completeness.
What I can confirm is that my render has similarities but not exact properties as yours. It should be noted that my screengrabs are from an NVIDIA RTX 3080TI at 8K resolution so my screengrabs will look slightly grainier.
Here is what I can confirm. Your model renders fine and when I zoom in on the spots you noted, these can be explained by the fact that their is inflill at work in the base of the model. This can be displayed by toggling the check boxes in the render screen on and off, you will be able to see it change the rendering slightly.
As far as I can tell. This issue with the renderer is not affecting your output. This is actually good progress as it signifies that you can now address the filament output quality.
At this point, I might suggest going back to square one and starting over. The two things I would focus on is these two:
- Filament Calibration,
- Running in Silent mode to run at 50% speed.(this is purely for diagnostic measures.)
If running it at half speed changes the outcome, then this points to a filament flow issue which can be compensated for in the filament profile and/or in the speed portion of Global properties.
Diagnostic Tip:
Cut your model down to the height where the problem occurs to create a test case that you can use to run multiple quick tests. This will save a whole lot of filament and time.
I loaded the 3mf file from above into orca slicer 2.2.0.
It loaded up with .20 Standard @BB1 A1 using .28 layer height.
You can see the artifacts.
I changed only the layer height to .26 and the artifacts disappear.
Must be a math error in there somewhere.
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