Hi,
I have an Ultimaker 2, upgraded with Olsson block and an new fan shroud.
I'm having for quite some time moderate-to-heavy (but consistent) under-extrusion problems which I tried to fix using cold pulls, replacements of PTFE coupler, replacement of Nozzles but for the love of my life, I can't get it fixed. And recently it gotten worse, I'm getting 1 Extruder motor skip every so minute or so.
The prints are acceptable but not 'filled up', so there are consistent gaps in between the lines.
Outer surface quality and Z layer consistency is great.
Attached a few images, 1st 2 images are one of the terrible looking cold pull filament strands I produced recently.
The in-nozzle part is very clean, as it's a fresh nozzle but the part above it looks terrible, like there was something inside the head gnawing at it. Why? How?
I did do the E step calibration test, from the 100mm requested to be extruded, only 76mm was actually extruded.
Also, I did try to clean out the metal coupler/heat brake and the Olsson block but to no help. Anyone has an idea what the issue could be? Currently I have a Solex3d PTFE coupler in, I also had the I2K disc in and out, made no difference.
The worst case is to exchange the Metal coupler and the Olsson block itself also but that would be last resort.
Anyone having a clue?
Thanks.