Wanted to test if my printer could print a big hollow sphere with very thin walls and here it is. I got some interesting waving patterns in the print due to the printer head pushing the sphere around.
The result is a very light big ball that flexes a bit in the walls.
The model is made with 80K faces to make it really round.
Printed mine on an Ultimaker in white PLA at 0.09mm layer height, 50mm/s, no support and 0.4mm wall thickness at 215 degrees. Took 12h24min to print.
Scale the model to the maximum your printer supports and print :)