Hey folks
Recently my UM2 has started to grind filament and there is no stopping it :(
It grinds at random times, normally a couple of hours into the print.
Things I've tried so far:
-new nozzle, Ptfe and the metal thing that holds the nozzle (no i2k isolator as I didn't have one. The Ptfe is the original UM2 one, had one sitting spare.)
-Roberts feeder v2 following this tutorial: http://www.ideato3d.be/tutoriels/how-do-i-change-the-feeder-of-the-ultimaker-2/
-the yolk is a 38mm, and the bearing touches the feeder when there is no material inserted. Is this normal? I left the spring exactly at 13mm as per the tutorial.
-took the cover off the inside of the machine and pointed a 15cm desk fan at the feeder motor. It never exceeds 35°C, but Iam trying to eliminate everything.
-the boden at the feeder end had grinding on the walls, so what I did was cut it back about 4mm and smooth out the walls into a "cone" the the ver end with a hobby knife to eliminate unwanted friction.
Things to note:
-after Roberts feeder was put in, the grinding has lessened. It really has, but it still does it. Is the yolk too tight?
-I've changed 3x nozzles, to make sure that's not it.
-All fans run.
-printing PLA only at 185°C. (The filament is a tad old, set on the roll for about two months while I was out. Can that be an issue?)
Please help, Iam pulling all my hair out trying to get this going