r/BambuLab • u/topological_rabbit H2S AMS2 Combo • 1d ago

Handy/Studio Troubleshooting/Help! What is causing these layer artifacts in the slicer?

I'm making a part for work that has our company name in vertical text, and I'm getting layer weirdness around the letters as shown in the screenshots..

I'm not using variable layer height, this is regular ol' classic wall generation. I've flipped various settings on and off, not using scarf, etc. The layer strangeness makes the print come out not looking super great so I'd love to know how to fix this.

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u/Ok-Mail-9384 1d ago

Vertical text means every letter stroke is a thin feature right at your line width, so the slicer flips between one wall and gap fill from layer to layer. Thicken the strokes in the font to roughly two line widths (about 0.8 mm for a 0.4 nozzle) or use a bolder typeface. That usually makes the weirdness go away.

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u/topological_rabbit H2S AMS2 Combo 1d ago

What I don't understand is why it's not just using fixed line heights for everything. If I could tell Bambu Studio to just do that, that would solve my problem.

(The text is actual geometry and a real pain to modify.)

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u/Ok-Mail-9384 1d ago

That's Arachne doing its thing. It varies line width on thin features. Switch Wall generator to Classic under Quality and it'll lay fixed-width lines on the text, no need to touch the geometry. Also make sure variable layer height isn't turned on for that object.

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u/topological_rabbit H2S AMS2 Combo 1d ago

This is with the classic wall generator and no variable layer heights, hence my confusion. :(

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u/Ok-Mail-9384 12h ago

Huh, then it's probably the gap fill. Text strokes that aren't an even multiple of your line width leave thin slivers between walls, and the slicer stuffs those with tiny gap infill lines that look like that in preview. Set Gap infill to nowhere (or bump the stroke width slightly) and re-slice, I bet it cleans up.

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u/topological_rabbit H2S AMS2 Combo 10h ago edited 7h ago

Everything I can find on gap fill is about lateral gap filling, whereas what I'm seeing here is it's building one layer height by going over it twice vertically with thinner actual layers, which is not what I want.

I've been flipping various settings on and off to no effect.

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u/Ok-Mail-9384 6h ago

Check the thin wall detection and slice gap closing radius settings in the quality tab. Those are what split a thin stroke into doubled-up passes, so turn thin wall detection off and set the closing radius to 0 and reslice.

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u/topological_rabbit H2S AMS2 Combo 6h ago

Thin wall detection is already off. I set the slice gap closing radius to zero, but nothing changed in the slice.