<https://community.ultimaker.com/topic/16124-why-is-retraction-distance-set-to-65mm-in-cura-231/#comment-165048>
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"Thanks \nI am using PLA + PVA for the support.  I printed a model of a bone so it is complex internally.  On my U2 I found that prints failed until I reduced the retraction. \nThe first print ever with the U3 failed 1/3 of the way through.  I found the PLA filament ground most of the way through.  I reset the retraction distance to 2 and the bone printed nicely - although it took 13 hours compared with 3 hours on the U2! \nThanks you advice \nMM "
<https://community.ultimaker.com/topic/16124-why-is-retraction-distance-set-to-65mm-in-cura-231/?tab=comments#comment-165155>