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Check filament diameter. I had a case with cheap fillament that it was too fat (over 3.1mm) for the bowden tube. Too much friction and it the feeder could not feed the nozzle with material.
Also if your coil is too tight you will have same results.
Get some 30-28 gauge needles to unclog your nozzles. Go for the shorter ones, they are more difficult to bend.
I didn't like the default settings. They never worked for me.
Its really worring that you get grinding with a temp of 260c. try to setup the extruder motor so it doesnt apply so much force onto the fillament.
Up your print bed to 100-103c to get better adhesion. I'm allways using ABS slurry when I print with abs.
@Nick S: I really cant understand how you guys print without fans. I cant manage to do it if there is even a suspicius of an overhang over 40 degrees.
Hello
Give us some details about temps, speed, layers etc. Temp is related with the grinding you are getting. Bigger temp means easier flow so the feeder motor doesn't require so much force to push the fillament.
Are your fans at 100%?
There is no visible under extrution on the outside of the model though
lower speed and temp a little, 200c and 40mm/s and rotate marvin 45 degrees to get better airflow in front of him, left fan should point at the face.