Jojo's Bizarre Adventure Gyro Zeppeli's Steel Ball

thingiverse

This model is of the steel ball weapon from the anime Jojo's Bizarre Adventure. A step version is included to facilitate modification. I had luck printing the halved version (print two copies as the halves are identical) at 0.1 mm layer height, with 2 walls and 10% infill for most of it and 30% near the top and no bottom. If your Z height isn't dialed in well or your bed is warped a bit you might want to use a raft, though it needn't have a top surface.