This is a tree topper I designed for my Mega Tree. It is 6" which is much smaller than most you can find on the market which is what I wanted because I wanted my tree to come to a point at the top (or look as close to it as possible).

I designed this to be used with PixNode pixel strips for 12mm pixel nodes, and 1 3/8 in top rail (for chainlink fence) as the center pole.

I would recommend printing with ABS or PETG with at least 20% infill since it will be in sun and subject to warping. I did print mine with PLA at 30% infill and it has not warped over 2 seasons of usage in hot sun and major snow storms (which I am rather surprised by).