adegroot

Thank you for the guidance, Labern! I performed atomic pulls until the filament looked clean and smooth. The exterior of my prints (specifically the bottom) looks much better now. However, the infill grid is still of very poor quality - as can be seen in these photos. Is the next step to replace the PTFE coupler? Progression of filament during atomic pulls: Here you can see the correction of the bottom (fourth print is after the atomic pulls): Here you can see the infill issue still remains:

I'm hoping someone may be able to give me some guidance with a print quality issue. My Ultimaker 2 printer has been printing without issues for several months, and seemingly overnight the print quality greatly decreased. The infill is no longer printing well-supported internal structures. The result is a weak print that often breaks in half when being removed from the build platform. I've adjusted the speed (faster/slower), material flow (faster/slower), build plate temperature, material temperature, and I've changed filament, all to no avail. No other settings were changed when this print quality issue appeared. This is even happening to .gcode prints that came with the printer - MiniCalTest & Ultimaker Robot. It was a very sudden change, and I'm not sure what caused it, or what other settings I should try to adjust. I've attached a few photos that show the current print quality. Any advice would be greatly appreciated!