2

For some reason on my Raise 3D N2 plus with a Bondtech-Extruder I am sometimes seeing filament jams and sometimes it prints without any issues. I am using PLA at 215 °C.

When the filament is jammed I have to pull it out, remove the tip, and then I can load again and everything works perfectly fine again. I have attached a picture of what I pull out of the extruder each time. It looks like the bottom part is some kind of skin of the filament.

It's hard to see but the tip of the filament is a little thicker, so it's possible that this can't be pushed into the extruder, but why would it build up there? I am using 3 mm retract, could that be the issue? Or is my extruder not hot enough?

Filament pulled out of the extruder

Thicker part of the filament

Greenonline
  • 6,748
  • 8
  • 40
  • 68
DerDrucker
  • 21
  • 4

1 Answers1

1

  1. Heat creep can cause the filament to jam. The thicker end on a Bowden tube extruder matches heat creep. However, since lowering the extrusion temperature didn't help, it does not look like heat creep.

  2. Retracting too far can cause the filament to jam trying to go forward again. Have you tried less retraction?

  3. PETG can jam if you print too fast. I'm unaware of this problem with PLA. However, this problem gets worse with lower extrusion temperature.

  4. What is missing in the images for a direct drive extruder is any sign of the drive gear engaging the filament. There are no teeth marks where the gear pushes the filament and no notch in the filament where the gear turns but doesn't move the filament. Is your filament drive gear too loose against the filament to keep pushing it through the nozzle?

Perry Webb
  • 2,376
  • 2
  • 13
  • 19