This is the only place in the whole print where this happens.
You got more pics and details please?
Well, this part is missing filament, looks like the nozzle wasn’t pressurized enough, but I don’t know why. The supports (now removed) on that side looked the same.
Here’s a picture with more of the model:
Here it’s as close-up as my camera can get while maintaining some detail:
And here’s what the other side looks like and what this one should look like as well:
I suggest it is too much retraction since the underextrusion happens at a spot where retraction should happen
This looks similar to a problem I was having. Turned out that my extruder wasn’t calibrated properly and it was pushing far less material then expected. Try running an extrusion test like described in https://ellis3dp.com/Print-Tuning-Guide/articles/extruder_calibration.html
Have you set up linear advance/pressure advance? I found it worked wonders with making sure the extruder gets back up to pressure after a retraction.
No idea what it is, will check it out, thanks for the pointers!
I like teaching tech’s video on it. https://youtu.be/n3yK0lJ8TWM?si=kq1VvgqpiyAx3DAO
Here is an alternative Piped link(s):
https://piped.video/n3yK0lJ8TWM?si=kq1VvgqpiyAx3DAO
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I’m open-source; check me out at GitHub.
Looks like pretty classic underextrusion. Have you measured the filament diameter to see if it’s exactly 1.75mm? Even 0.1mm is enough to start causing problems. It’s prusament so should be good but worth looking! I can see underextrusion problems in more than just the problematic pillar, so worth playing with retraction and perhaps increasing temperature.
This happens from time to time regardless of filament, so I guess it might be the retraction settings, I’ll try adjusting them.
I have this with relatively old black filament I own. It’s okay for larger areas, but smaller ones will underextrude. Is the filament old, by chance?
I’ve had this issue before with cura years ago in certain features.
It sounds like you’ve tried multiple filament spools now, correct? Assuming at least one of them was somewhat new and dry I think that begins to rule out filament.
What slicer and firmware are you using? Even though cura/marlin didn’t have pressure advanced back when I ran into this it seemed like what was happening. The area impacted was either the start or the end of that layer.
It’s called “Unretract underextrusion”. It can be caused by problems in the hot end, or a problem with your settings (not extruding enough overall, retracting too much and molten material making its way into the cold-zone of the printhead), and other such things.
