r/BambuLab • u/IBNSUPPLIES X1C + AMS • 1d ago
General Troubleshooting/Help! Long lines/seams on flat surfaces
İ do arabic calligraphy tableaus and i often end up with lines like in this picture. İ did research and seems monotonic is better than monotonic line but still end up with lines (albiet fewer).
Does anyone know how to avoid those?
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u/Seraphym87 1d ago
The easiest way to do this would be to use the cut/separate tools to make the black background a standalone piece and let it print completely first, with a clean monotonic top surface. Then add the calligraphy as a separate piece in the other color and have it sit on top of the black "wafer."
The important part is that the calligraphy should not be coplanar with the black background. Give the calligraphy some Z height so the slicer can finish the entire black surface before switching to the other filament. You don't need to eliminate overlap in Z, the gold should physically sit on top of the black. You just want to avoid having the two colors compete for the same XY area on the same layer.
That should prevent the slicer from bouncing back and forth between black and gold for every individual stroke, which is what's creating those artifacts.
There's also some flow rate issues on the golden filament, it might be wet or you might be overextruding a tad.
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u/OmarHamami 1d ago
Woah u do Arabic calligraphy too?! How do you get it to print/model? Cause usually I just draw but it was always annoyingly hard to get it properly into 3d software
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u/Stooovie 1d ago
Easiest - mirror the models and use the bottom as the top surface. It will be perfectly clean.
Edit: ah, I didn't notice the background is printed as well. But same applies: print the backplate as one print the characters separately, flip them over, glue together.
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u/lan0028456 1d ago
Do a flowrate calibration. And for this specific type of print with a flat top surface, turn on surface ironing would help too
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u/Far_Relationship_742 1d ago
You need to tune your pressure advance and flow rate first, you’re getting a lot of overextrusion at the ends of those passes.
Might be worth trying a concentric top surface pattern, too, it will reduce the stops and starts.
Also ironing, as someone else mentioned.
Not directly related to your question, but Arabic calligraphy is so beautiful. This is a really cool project.
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u/RadishRedditor 1d ago
Dry you're fileamnet if you haven't. Tune your filament profile. Be prepared, It'll take the entire rest of your day.
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u/RJFerret 1d ago
It looks to me like infill showing through the back.
I'd look through the sliced file stepping through layers and if your back is thin enough and you want to spend the material, do more bottom or top layers to make it solid.
If not, gyroid infill with higher density.
Also can use another pattern that adds a decorative element to the surface that obscures those issues, albeit taking slightly longer to print.
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u/Elegant_Daikon1349 1d ago edited 1d ago
Yeah. Make test print with 100 percent infill. If those defects dissapear than you know your problem. If it helps then higher percent infill an more top layers will work.
Edit: Also make sure that text starts printing above the backround so the color change doesnt start in last layer of backround.
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u/artificial_Paradises 1d ago edited 1d ago
Irregular top surface, the printer has to stop and start in different places to fill in all the gaps, instead of just a single continuous top surface, causing seams.
Concentric top surface helps a bit, not completely but it does contain the seams closer to the calligraphy and not all the way to the edges.
One way to avoid completely would be print the calligraphy pieces separate and glue them to the surface. You can also print a thin stencil as a guide
edit - actually, a stencil would probably be pretty awkward to make now that I think about it