Uneven layer and rough surface

General LulzBot Mini
1

IMG_2199
IMG_21993024×4032 2.21 MB

IMG_2200
IMG_22001512×2016 1.14 MB

I am currently using a Mini 2, and it has been printing well. However, starting yesterday, the print quality has deteriorated. As shown in the uploaded photo, the printed surface of the model is rough, and the layer density varies.

The printer settings were as follows:

Material:

  • PolyMide PA6-GF

Quality:

  • No change

Shell:

  • No change

Infill:

  • Infill Density: 70%
  • Infill Pattern: Lines
  • Others: No change

Material:

  • Default Printing Temperature: 290°C
  • Printing Temperature: 290°C
  • Probe/Soften/Wipe Temperature: No change
  • Printing Temperature Initial Layer: 295°C
  • Initial Printing Temperature: 280°C
  • Final Printing Temperature: 275°C
  • Build Plate Temperature: 60°C
  • Part Removal Temperature: 50°C
  • Others: No change

Speed:

  • Print Speed: 60
  • Others: No change

Travel:

  • No change

Cooling:

  • No change

Support:

  • Generate Support: Checked
  • Support Placement: Everywhere
  • Support Overhang Angle: 60
  • Support Pattern: Zigzag (connect support zigzag)
  • Support Density: 15%
  • Others: No change

Build Plate Adhesion:

  • Build Plate Adhesion Type: Raft
  • Raft Extra Margin: 5mm
  • Others: No change

Mesh Fixes:

  • No change

Special Modes:

  • No change

Experimental:

  • No change

Please let me know what could be causing the uneven layers and rough surface.

2

Has it printed this same filament before without any issues?

3

Did you have wet filament?

4

Yes, I have been using the same filament, and it printed fine before.

5

No, the filament was not wet, and there is a low possibility of it getting wet in the room.

1 Like
6

It looks like it was dried and then printed but not printed from a dryer. So the first bunch of layers are fine since that was the exposed surface in the dryer but after that passed it started the typical nylon hissing and spitting. Not a fan of nylons, they need a covered dry path from a dryer to extruder with a bowden tube. Or they behave badly.

7

It looks wet.

What drybox are you printing from?

How did you dry it before putting it in the drybox?

If you aren’t printing from a drybox, the filament is wet. Nylon is aggressively hygroscopic. If it is just out in your room during print, it’s wet. If you didn’t dry it beforehand, and it’s fresh from teh box, it’s suspect on dryness.

If you’re printing from a drybox with desiccant, and ran the filament in a dryer for 8-12 hours before putting it in there, you can consider it dry.