I've been trying to print
https://www.thingiverse.com/thing:246198 also attaching the gcode. The problem is when it starts to print the feet, it does multiple preload adjustments within the feet which eventually ends up blocking the hotend. I then have to retract the entire filament, cut the end and then reprint, which causes it to block again.
It works perfectly when I use CURA 15.05 to print with the same retraction setting as in KISSlicer.
I use an original Prometheus 2 hotend with a e3d titan, recalibrated with the calibration tool by Michael Hackney from Sublime Layers, and I've got the error deviation down to .2mm over a 90mm extrusion. I even tried the same gcode with a Chinese J-Head made of PEEK and an aluminium heaterblock, which I know works perfectly and has multiple 100 hours of prints on and I even managed to jam that nozzle. The preloadVE tuning wizard cube with rounder corners prints perfectly, and I have managed to zero in on the prelaod value. On large prints with some filament extrusion between the preloadVE adjustments this problem does not manifest and it prints perfectly.
Maybe if there could be configurable threshold of .5 or 1 mm between any PreloadVE and retractions, this problem could be mitigated. Such a feature is present in the older builds of CURA, possibly to avert the same problem. Another possible solution could be to do a solid infill below a certain threshold, something similar can be found in Slic3r. This would also strengthen the part and also avoid unecessary retractions and preload adjustments when the infill is 10%.
Also file attached is in 7z format, regular zip file was too big to be attached.