Print this with the flat base down. No support is required. Use a brim for stability. I used 15% Support Cubic infill starting at ~1 inch (26 mm) to support the top of the sphere. Do not use vase mode. The default size is 3.15 in (80 mm) diameter, but it can be freely scaled. I found 70 mm works better with some of the ornament holders available on Amazon.
I recommend silk PLA, single or multi-color.
Note: the block that appears at the bottom of the 3mf file is just the modifier to prevent infill at the bottom so that you can insert the ornament holder.
The author marked this model as their own original creation.