Extruder Clicking and/or Underextrusion?  

Extruder Clicking and/or Underextrusion?

Hey all,

going on second week after getting my MK3 and still facing some printing issues. Primarily, my biggest issue is that my extruder sometimes fails to push material down through the gears into the hotend. This results in failed prints such as these:

That's with Ivory Prusa PLA at default temperatures, .1mm layers, and reduced speeds. It isn't just the ivory it happens to, but all materials I try.

I'm able to usually identify the issue because I can hear clicking coming from the extruder, either caused by the motor skipping gear teeth or slipping over the material, I'm not sure which.

I have been able to get successful prints as long as they don't take more than an hour or two, but anything longer than that will fail. I've come across similar issues in other threads where overheating motor softens material and causes it to bunch up, but my filament doesn't bend and kink, and supposedly that issue was resolved by a firmware update (my firmware is completely up to date). Could something else be causing this? Has anyone else experienced similar issues?

Thanks in advance