The model has 2 small holes at the top to make it easy to add a thread to hang the ornament. The holes are great for thin threads, but may not work for everyone. I've also provided a version of the STL with no holes so you can add your own. 

You can add holes without changing the geometry of the model. Just add a cylindrical shape modifier the size and place you want to add a hole, then set the properties of the modifier to 0 for top, bottom, infill and perimeters. 

I've provided two PrusaSlicer project files and GCODE files for a PRusa MK3S+ printer. One is for opaque filaments, the other transparent/translucent filaments. The opaque version has 2 perimeters at the bottom, 3 at the top, and 1 in the middle of the ornament. The transparent version has 1 perimeter everywhere, less dense infill, and prints a little hotter.

If you use your own settings, it needs a little infill at the very top and bottom. I used 20% lightning infill for opaque filament and 10% for transparent. 

You will need supports. I used organic supports with an overhang of 30 degrees and added paint-on supports at 20mm and 60mm. The paint-on supports might be more than you need, but the print worked beautifully and released easily.

I recommend using the Classic perimeter generator, not Arachne (the default in modern slicers).