Vase Mode changed the name in some version before 3.5. Now you can achieve this with 2 modes: "Surface Mode" and "Spiralize Outer Contour". To turn it on do this:
- Choose the Custom setting menu on the right
- click a gear to set up what settings you want to see
- Under the header "Special Modes" you find both Surface Mode and Spiralize Outer Contour
- set the checkmarks on both
Turning on the Surface mode to
Surface and checking
Spiralize Outer Contour gets the "classic" Vase Mode.
Spiralize Outer Contour gets an infill-less outer perimeter
Now, the classic Vase mode will only print the single most outer perimeter of a print, so your model will have to be very limited with angles and contain no bridges - with one perimeter, you will only be able to print at best 45° angles!