In expert settings, set the two retraction values to 0. ESPECIALLY minimal extrusion. If you have this as low as 1mm, it still takes about 200mm of horizontal printing (at .1mm layers) before it has moved enough to retract. Just set these both to 0mm and you will be safer.
edit: arrg. edited this 5 times. It's about 200mm.
2.85 diameter versus .4mm diameter nozzle means 1mm extrusion of filament is (2.85/.4)^2 or 50X as much or 50mm of .4mm diameter extrusion.
50mm extrusion of .4mm at .1mm layer height should be about 50 / 0.1 (layer height) gvies you 500 dots of extrusion times about .4mm length of each dot gives you about 200mm extrusion.
There's a https://github.com/daid/Cura/issues/635 (and maybe earlier versions?) that will be fixed in the next release, that retraction doesn't trigger when the distance being moved between parts is less than 10mm. Perhaps that is what you are seeing?
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