Under Extrusion mid print

[johnfrank]

Hello all

Lately i see this problem in my prints. At the half of the print i see under extrusion and this typically happens more with PLA or PETG. My last print is a house i printed in PETG by Real Filaments at 50 mm/s, 245 degrees.
These are 3 images i took






With ABS i had this problem once. What do you think? I guess is mechanical problem of the printer.
I forgot to mention that i have an Ultimaker Original +

Thanks for any suggestions
Edit; i reuploaded the images. The more possible is to be a hardware problem. When i tweaked the retraction settings i saw better results, but still the problems continue.
Do you have any problems with UMO+ ?
John

[JoeJ]

I cant see any of your images... But in some of my past prints, if it suddenly starts under-extruding only in one small section of the print, this usually points to an extruder issue. Could be the drive gear tension, clogged nozzle, loose set screws, etc.

[razster]

Images aren't working for me either

[johnfrank]

i reuploaded the images guys

[JoeJ]

It looks like an extruder issue. Those sections of your part have more retractions than other sections, so perhaps the filament moving back and forth during the retraction is making the extruder issues more prominent

[KeyboardWarrior]

I think speed may be a big factor here. Those areas would be printed slower due to the Cooling Overrides in the Cooling tab. If you disable or modify the settings for Speed Overrides, I think that may help.