This is a Christmas tree.
You can put a white LED tea light in it, so it glows. The ones I had weren't good enough, so I used a different LED light.

The one on the pictures wasn't printed as good as it could be and it also fell on the ground one or two times, so it's a bit messy.

Also I wanted to make a small ornament for the top of the tree (That is why there is no strands there), but I didn't had time. Maybe I'll do it for the next Christmas.

Strands are connected to sacrificial wall, which is removed afterwards.
(See picture: post_processing.jpg, The picture is for lion, but it process is the same)

This was printed with green transparent PETG, but it should also work with other materials.
If you are having problems, adjust bridging settings in your slicer.