Duplo ionic column. Proportions loosely taken from Vitriuvius.

This is in three parts (base, shaft and capital). I also included a half-height version of the shaft.

Only the capital part needs supports. (The other parts, printed without support, do show some sagging, but only on the inside). I used white PLA, although ABS would probably be even better (and obviously, Greek columns were generally painted).

OpenSCAD file included in case you need to adjust the tolerances. Be warned: this is a long compilation (the capital took more than one hour to compile on my laptop).