Update: Due to popular feedback I have widened the base edge of the stars so that they can be glued together more easily! Try the files with the suffix "wide" for the broader edge.

Here's a simple tree topper star. There's an 8" version, and a 10.4" version. Both are about 0.05" thick, and on my printer that came out to an even 3 perimeters.

It's designed to print clean with no support or infill. Print 2 and glue them together!

The 10.4" version took about 2hr per half.

Enjoy!