Yet another star to top a tree!
Print two copies to make the front and back and glue together. I took a short strand of white lights from an old star topper and glued them into the inside of each of the points of the star. By using 10% infill and a milky PLA, I get a nice glow without seeing the individual bulbs, which is what I wanted.
Source on Tinkercad: https://tinkercad.com/things/8EmGYstFJhd