Thanks! I will check the belts.
I was having a lot of similar problems on my UMO+ (mainly underextrusion), and aside from one loose pulley, changing the teflon coupler has gotten me back to printing like new. I'm guessing I have about 500 hours on my printer and have done 99% PLA.
So I recommend getting yourself a new teflon coupler and maybe buy a spare for future use. My old coupler did not look bad--it wasn't burned or anything--but it no longer had a square edge at the exit end, which was allowing the filament to bulge before it entered the PEEK part, and that caused excessive friction.
Another symptom was filament grinding at the feeder periodically, and sometimes a filament jam at the beginning of a print. Also it was getting difficult to remove filament from the bowden tube when I would change spools due to the bulge formed at the tip of the filament.
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lucianofoglia 1
Thanks! I will check the belts.
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