An LED tealight will fit into the star with a friction fit. The star can be used as a stand-alone decoration or the tree-topper mount can be used to fit it on top of your Christmas tree. A small amount of the tealight will show to ensure you can remove it if necessary. The tealights I used are cheap RGB LED's that fade between different colours quite nicely.
Print the star with 0% infill and only one shell to allow the light to illuminate the star. It should print without supports. The flat surface above the tealight can be left in place but I found that as it's a single shell bridge, it was easy enough to remove to increase the illumination. The model includes brims for each of the build-plate points. The brims should snap off quite easily.
Print slowly because it's quite delicate until the five legs join together. This can also help keep overhangs quite tidy. I used old rainbow silk PLA for this one. I had some stringing in the lower portions of the star that was easy to tidy up. The Tree Mount is a pretty straight forward print that should work on default settings.
I printed this on a BambuLab X1 carbon. Aside from slowing down print speed and acceleration, I found that disabling the auxiliary fan gave best results.
CAUTION: The points are quite sharp so keep out of reach of children.
Edit: I've added an additional model with a slight variation. There's a hole it the top point of the star to make it easier to hang it from the tree etc.
The author hasn't provided the model origin yet.