I tried slicing a few vases in mattercontrol and cura 15. both had problems.need to reduce polygons. I thought I would try cura 3.6. seems to have sliced it w/o a problem/ I checked the starting g code and it had the auto level in there. but when I went to print it didnt do the auto level sequence. and started to print from whatever the height of the nozzle was at. okay maybe i 'll try the newer mattercontrol. the older version had an option to select spiral vase. I cant find an option for spiral vase. I cant even find the percentage of infill to select 0 I only see, starting angle, infill overlap and fill thin gaps. I really didn't expect this to become difficult. what am I doing wrong?