I designed this to print easily, to be light (under 25g), and to look elegant when printed in one color.
Not for commercial use. Please see license agreement.
I've provided two versions ornament - with and without custom supports. With the built-in supports and a raft, no other supports should be necessary.
With my print settings, the ornament takes about 6 hours to print.
The only difference between the original version and the current is which direction the loop at the top faces, which changes which part of the ornament faces forward. I'm not sure which version I like better.
PRINT SETTINGS Layer height: 0.15mm
To make the print as light as possible, I printed at just 0.4mm walls and 0.45mm top/bottom thickness. I also used Cura's Support Blocker and Per Model Setting's "Modify Settings for Overlaps" to add 20% infill - but just for the bottom 30 - 35mm of the ornament.
I recommend using the versions of the ornament with built-in supports and printing with a raft. The raft helps to reduce wobble in the X and Y axes during printing. You could try using a brim instead, but I haven't tested that thoroughly.
There are other parts of the ornament that appear to need infill, but they are self-healing and do not show in the final print if you leave out the infill. Infill is really only needed to the bottom of the inside of the ornament. Adding infill everywhere will really increase the weight, which means it may not work on all Christmas trees.
If you print with 0.4mm walls and you wind up with holes in your print, I recommend increasing the flow rate slightly and maybe increase the print temperature, reduce travel speed, or reduce print speeds.