We found out while decorating the tree that we no longer had a tree topper.
Since I had a Circuit Playground Express handy, I installed CircuitPython on it, and wrote up some animations for my kids to select, then designed this tree topper around it. Link to the Python scripts are here.
The model can be printed flat and connected with included dowels. To be safe, the tolerances on the dowels are probably a little too lose, and I ended up using museum putty to hold them in. May want to print them separately and upscale them to 102% or so.
I printed with organic supports using .20 layer height in Prusament Transparent PETG with minimum of 3 perimeters (probably overkill). The pegs should go through the 3 GND slots to keep the Circuit Playground Express in place.
The author marked this model as their own original creation.