The 3mf file contains two volleyballs. The parts are oriented face down so that the front of them pick up the texture of the build plate. I've found that doing this with a textured build plate creates a nice finish on the surface and help hides the lines created when the filament is laid down. They are roughly 1.58" (40.1 mm) in diameter.

The file is split into objects for each section of the ball, so selecting filament to match your desired colors is super easy. They are split into the following parts:

Back

Black

White