How to remove layer line I believe caused by ironing

Bambu Lab Software Bambu Studio
1

Hi!

Printer:
X1 Carbon

Filament:
Bambu PLA Matte (dried 8 hours, desiccant loaded in AMS, humidity sensor reads 1 out of 5, aftermarket hygrometer reads 10)

Room Temp
~60f/15.55c

Ok first I just want to show off this print. I’m new to 3D printing and I think it came out fantastic!:

IMG_8554
IMG_85541920×1440 296 KB

IMG_8555
IMG_85551920×1440 258 KB

But it’s not perfect. My text wasn’t coming out that great so I turned on ironing. The text is on a lower layer than the top lip of the part so I needed to turn layering on for all top layers [is there actually a way to only iron the top face of the text by selecting what I want ironed?]. So I believe when ironing is done on the layer for the blue face shown below the nozzle pushes the layer down expending it outward causing that line:

Screenshot 2025-03-30 at 1.27.24 PM
Screenshot 2025-03-30 at 1.27.24 PM2434×1760 223 KB

IMG_8556
IMG_85561920×1440 137 KB

IMG_8558
IMG_85581920×1440 164 KB

It actually looks like a few layers are effected. Feels about .005" wider than the other layers and it’s the worst around where that square pocket is.

Settings:
Screenshotting my settings took 13 images lol and I’m only allowed 5. Linked below is a youtube video where I cycle through all settings. .3MF is also attached below

Troubleshooting steps:

  • Sped up ironing by 10mm/s [now @ 40mm/s]
  • Turned down ironing flow 1% [now @ 9%]
  • Turned aux fan down from 70% to 50%
  • Printed with door/top closed
  • Shrunk the pockets ~.25" on each side so the pocket isn’t as close to the outer walls of the part.
  • Added small radius to that square pocket

Whatever I did seemed to help just a wee little bit. Didn’t seem to do much.

Bin.3mf (1.0 MB)

3

If you added the text in Studio or as an individual object, you can toggle the Process Global ↔ Object switch above the settings to get the object tree. You can then set ironing only for that object.

That will probably not be enough to remove the “hull line” though. For that, check the different previews (layer time, speed, flow) for root causes. You can help the line a bit by having a fillet or chamfer on the inner top surfaces but probably need to experiment a bit.

1 Like
4

I don’t think the line is caused by ironing. It is usually attributed to a drastic change in layer time. There is a similar line up in the black, coinciding with the beginning of the rim. Layer time drops at the beginning of the cavity. Ironing has little effect:

image
image1045×297 82.9 KB

Slowing down the entire print might be your best solution.
I usually ignore such lines in favor of finishing quicker.

If you first save your preset changes as a “Preset Inside Project” you can use the Compare presets tool to summarize the modified settings in a single screen capture. We all have the default presets, just need the differences.
image

image
image818×709 22.1 KB

2 Likes
5

Only had time to figure out how to add ironing on only the top layer of the text but I figured it out. YOU ARE THE BEST!!!

1 Like