Prusa Mini under-extruding in patches - Cannot figure out why
Hi Prusa forum.
I bought a second hand Prusa Mini and I've got some extrusion-problems I don't know how to solve. When printing a simple 100x100x1 sheet, the print starts off with a beautiful and essentially perfect first layer. However, after a few layers the printer starts to seriously under-extrude, looking almost as if the printer fails to extrude properly for a short while and then continueing again. See attached image.
Does anybody know what might be the problem? I have:
- Changed the hotend PTFE tube, double-checking that there is no filament residue before inserting the new one.
- Replaced the nozzle with a completely new one.
- Loosened the idler lever screw on the filament sensor.
- I think I have a sensible tension on the extruder idler lever screw. I tried tightening it 1 turn and printing the plate again but same issue occured. -
- Have achieved essentially perfect z-offset (printing on the satin sheet).
Thanks in advance!
RE: Prusa Mini under-extruding in patches - Cannot figure out why
Check the wear out of the bowden tube between the extruder and the heatbreak
See my GitHub and printables.com for some 3d stuff that you may like.
RE:
Thanks for linking this amazing resource. It turns out this probably was just a simple under-tensioned extruder idler lever screw, but what you linked is very good to know in the future.