I made these to go with the great tree designed by SynJa.
These were sized to the largest 160mm tree but i'm sure they will work for all of them.
Use a heat gun or lighter to bend the Christmas tree balls hooks into shape after they are printed. To attach the star I removed the top few rows if foliage from the tree to expose the stem.
Note: I had to slow my printer down when printing the stems of the balls. Supports used for the star.
I ended up printing around 40 balls for our tree. Using 3 different colours for the balls and using yellow for the star.