this post was submitted on 30 Oct 2025
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Gaps in first layer, but not in brim? (infosec.pub)
submitted 3 days ago* (last edited 3 days ago) by Fmstrat@lemmy.world to c/3dprinting@lemmy.world
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Hi all,

The attached photo is my brim (top) and first layer (bottom) after stopping the print. I've noticed that my brims look totally fine, but the first layer of the print itself has gaps between the lines.

How do I go about debugging this? I'm using Orcaslicer with an SV08 Max, and customizations I have during slicing include dropping the nozzle .2mm with the following Machine gcode:

G90 ; Absolute
G21 ; Use metric
M83 ; Use relative distances for extrusion
SET_GCODE_OFFSET Z=-0.2 MOVE=0

And a flow ratio of .96 with this ABS, which I commonly use on the Voron as well.

Thoughts?

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[–] empireOfLove2@lemmy.dbzer0.com 5 points 3 days ago* (last edited 3 days ago) (1 children)

Is it underextrusion/too high gaps or overextrusion mountains pushed up by the nozzle? It's hard to tell if there is actual space between the plastic lines. Is this leading to print fails or bad first layer quality when the part is removed?

A tactic I've noticed in Orcaslicer, when using Bambu presets on my x1c, is to slightly overextrude the first layer. This forces the plastic solidly into a textured bed surface ensuring you get maximum hold. This leaves the first layer looking kinda shitty on top but fully filled in underneath. And it doesn't do this for the brim either.

[–] Fmstrat@lemmy.world 1 points 2 days ago* (last edited 2 days ago) (1 children)

Yea I'm beginning to wonder of flow rate isn't adjusted for the brim. I may do a test as you can see through the gaps.

The layer looks "OK" after but you can see the lines more than normal. The biggest failures are ABS coming off the plate during the print.

[–] empireOfLove2@lemmy.dbzer0.com 1 points 2 days ago

Well seeing as the brim is pretty smooth and properly filled I'm guessing it's not a machine bed leveling thing.

Wondering if your print preset is messed up. Go to the Quality tab with advanced settings in orca, and near the bottom there should be "bottom surface flow ratio" as well as "elephants foot compensation" (i think, going completely from memory here) You may need to turn up the flow ratio and/or down the foot comp to get the bottom layer squeezed together properly, the defaults with the sv08 profile might not be right for your particular plate.

[–] spitfire@lemmy.world 2 points 3 days ago (1 children)

Any chance your z-offset is making the nozzle too close to the plate/too high flow rate for it?

[–] Fmstrat@lemmy.world 1 points 2 days ago (1 children)

I don't think so since there is no "squish"

[–] spitfire@lemmy.world 1 points 1 day ago (1 children)

Try it, I was thinking the same thing once and it did turn out to be the case

[–] Fmstrat@lemmy.world 1 points 1 day ago

OK, will so some test layers