I am a mechanical design engineer and recently I bought a UMO+.
I am having a lot of trouble with grinding of the filament.
For setting up the tension on the feeder.
I heated up the nozzle to 210C and released all the tension from the feeder.
Then, manually started to move the feeder wheel and tension up the spring until some filament was extruded.
At this point, I can see some marks on the filaments running through the bowden cable. (IDK if this is normal)
I can print some parts, without retraction, if they are under 3 hours.
I tried to print a 6 hours print today and it stop feeding after the 4th hour. No more filament coming through the feeder.
After canceling the print, with the nozzle still hot, I was able to push the filament manually like 3 mm and the filament came through the nozzle.
I appreciate any suggestions!
PS: I also have troubles when I use retraction, the filament gets grinded very soon. I believe it is related.