Spiral Xmas Tree Ball
You can modify the STL to add your name or your greetings along the spiral, it could be a nice present for your friend :)
Spiral Xmas Tree Ball
I've found that the best way to print is lay down the ball on one side and use support touching only bed plate.
I suggest to not exceed with print speed.
I use 30mm/s and 0.1 layer height.
The ball has 100mm of diameter, you can scale it to 60-70% to reduce print time and still obtain a nice decoration.
Be careful when removing supports!
The author hasn't provided the model origin yet.