Ultimaker S5 extrusion issue

[evashe2 0]

After a year of use, I started to have an issue with extrusion. During the first layer, the print core will start to clog and the filament will grind up in the feeder. The first layer seems to be pretty thin, but I'm not sure if this is my imagination. The printer is up to date for the firmware, and I went through the whole list of maintenance to try to troubleshoot the issue. After replacing the print core, manual leveling the bed, cleaning out the feeder, adding magnalube to the feeder gear, and greasing or lubing all of the axis, I'm still having the issue. To top it off, Cura is now unable to connect to the printer. Any help is appreciated.

[mkaj2019 17]

I am using an Ultimaker S5 in my company also for about a year (over 1000h print time). I am now also suffering from underextrusions but I cannot find the source. 

I cleaned the extruder, I performed a lot of cold pulls and I swapped the print cores. It is still the same result. 

 

I am using Cura 4.3.0 and the S5 Firmware 5.2.11.20190503

 

Edited January 15 by mkaj2019