Filament grinding when retracting

[laertes 0]

Hi, I am having problems getting my new UM3 print models with medium to large amount of retractions.

I slice using Cura 2.4.

The same model prints fine on a UM2+, sliced with Cura 1.5 ( latest update)

When looking at the filament I can see a 2 cm long stretch where the extruder have flattened it.

I have tried with Torwall, colorfabb and ultimaker filament with the same result.

I have tried the settings in Cura 2.4 that reduce the number of retractions allowed but that makes the stringing unacceptable.

regards,

/Lars

Edited March 23, 2017 by Guest