I've provided my PrusaSlicer 3MF file and GCODE for Prusa MK3S+ at 100%. It provides a nice balance of print quality, speed and weight. If you want even better quality, you may want to increase the supports or use 2 perimeters everywhere.

Not for commercial use. Please see license agreement.

One of my larger Christmas ornaments, it scales down nicely to 75%. I've now tested my PrusaSlicer 3MF file and GCODE at 75% and they print very well. If you want to print a different size and use my 3MF files, you'll need to adjust the range settings for the height range modifiers. PrusaSlicer doesn't adjust them when you scale the model they're linked to. Hopefully, they'll add that in a future release. I added it to their wish list.

I used 2 perimeters for the first 2mm and for the stem at the top. For the rest, I used just 1 perimeter. There are 4 places in the bottom of the ornament that need a few layers of infill (I used grid), but there's really no need to put infill everywhere. I set top and bottom to 3 everywhere except where the arms converge at the top. There, I increased them to 8 to get a clean, solid print.

The ornament needs quite a lot of supports. I used paint-on supports set to organic.