Need a fancy bow-tie for an event like new year's eve, but don't want to use support to print treppi's papillon design?
Well, throw it into OpenSCAD and shave a teensy bit off the back and give it some overhang-friendly notches!
Slice without support, and print away!
After printing both parts, slide the printed papillon_base.stl onto the shirt-button to see if it fits (it should fit loosely on an unbuttoned button, but fit snugly once the shirt is buttoned). If it does, then super-glue them together and go party!