Not great, not terrible...Lower quality at home: horizontal lines

Hi everyone,

I would like to ask for some help with my Bambu Lab P1S with AMS. This is a brand new printer, only tested in the shop where I bought it. During the testing in the shop, it printed beautifully (around 30 - 40 hours of printing with various types of parts), however, when I brought it home and set it up, the quality was not the same. This issue is mainly noticeable in the wall lines:

Although the shop already did the k-value, flow dynamics, and flow rate calibration, they suggested that I should do it again at home - so I did. When I saw that the quality was not as good, I repeated the calibration, but it didn’t help.

Then, I placed the printer on a concrete slab with vibration dampening foam underneath, hoping the excessive vibration was causing the lines, but this didn’t help either.

Now the printer is on the floor, but the result hasn’t improved much.

I tried various settings, but it didn’t really bring any improvement. I am printing with Fillamentum white PLA.
Temperatur is: 210°C
Bed temperature 55°C (textured PEI Plate)
Layer height: 0,12 mm
Wall loops: 5
Outer wall speed: 60 mm/s (inner: 150 mm/s)

I am sure it is some software setting issue in Bambu Studio because the results were good in the shop, and I am using the same material at the same temperature.

Thank you in advance!

Is this the exact same unit than in the shop?

Did you print it with the door open and the lid off?

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Yes, same printer, same AMS. I print with open door and the lid is off.


We will assume it’s not a mechanical issue then.

It might coming from the filament itself. Inconsistent filament diameter. And or humidity inside the filament.
Did you tried other spools? Was the wall quality the same?

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Yes, I tried other filament (same brand) I even dried it in Sunlu filament dryer. And sadly the wall quality is the same.

If you have a caliper, you cloud check the filament diameter consistency. But for now we will assume the filament is ok.

In the slicer settings you could try to set the wall generator to default (not Arachne)
And set the walls printing order to inner/outer/ inner or outer/inner. That should results in better quality walls. But that will not work well on part with big overhangs. Like your part with the big fillet at the bottom.

Could you share your 3mf file or a screenshot of the sliced object in flow or speed view?

I am using the classic wall type in Bambu Studio. I uploaded the 3mf file:

[Bambuproject_0,12_horizontal_lines.3mf - Google Drive]

Thanks. the only thing that seems really off is the filament temp. it’s set to 220 instead of the recommended value of 190-210. PLA Extrafill | Fillamentum
I’ll try to print at 200-205 with this filament and redo the auto flow calibration with the new temp.

And for quality of life, you could use painted support to avoid having them inside the slot

@R_Fact have you done the following:

  • Recalibrate the printer after you moved it and installed it at home ( the concrete slab is perfect solution)
  • Flow and K calibration of the Filament you are using on a dry fillament
  • Also you may want to try slightly higher layer 0.2
  • Try changing the infill - but that should not be the reason
  • Check the belts from transport might have happened something

Thanks for the help, guys! I am printing the material at 210°C (the 3mf file had 220°C, but I manually adjusted it on the printer). The belts are fine, and the infill is giroid, but I will try lines as well. I will check the results using Bambu Lab white PLA with the same settings.

This sudden drop in quality is very interesting, and I will get to the bottom of it.

Check if the hotend is well tightened

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It may seem silly, but it’s happened before. Check that the two hotend screws are well tightened

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I checked, those are absolutely tight.

Printer calibration was mentioned by vladimir a little further up but haven’t seen a direct response on that from you. Any time you do changes to the surface the printer is standing on you will need to run the full printer set-up calibration procedure (X1 screen Utilities - Calibrate) since surface changes including anti vibe mats or feet change the printer resonance dynamics and thus can greatly effect the appearance quality if not re-calibrated for.

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yeah this could be the reason also you may be overthinking the platform its on the machine calibration helps compensate for most of the vibrations, there was even a youtuber that tested an a1 mini hangin while pringint and it had little affect… to me it appears to be a partial clog do you have another hot end to test and rule that out, or perhaps try a cold pull as described on wiki, might clean out any small contaminants that may not be allowing full filament extrusion

I recalibrated the whole printer. And, I printed the 3mf file of the model thoose in the shop printed for test. The difference is: the testmodel printed with 2 walls, 0,2 mm layer hegiht, the “striped” model printed with 6 walls, 0,16 mm layer height. Everything else are the same (temperature, speed, etc).