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Too many retractions?

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Posted · Too many retractions?

I was trying to print Mac OSX Recycle Bin  with no success. I am using default UM2+ retraction settings (6,5 mm @ 25 mm/s) with ColorFab PLA/PHA at 208 C and 30 - 40 mm/s print speed (0,16 mm layer height). Feeder tension is set as default (in the middle).


After 10% of progress extruder stopped feeding filament because of grinding. I know this model requires a lot of retractions, but I found interesting how filament got grinded. The feeder teeth was getting deeper and deeper in filament across the length of 50 cm. Filament flattened from 2,85 to 1,9 mm and than grinding occurred.

Is this usual behavior before grinding?



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