I looked for hours to find a perfect orb ball for my kids to use as an accessory to their “Inside Out” costumes.  After finding nothing I designed this.  You'll need to print both files as one is an inner part and the other is an outer part that clamp together very snugly.  I have printed the halves with and without supports and a brim to ensure plate adhesion.  I'm not so sure there's much difference other than the inside might be slightly smoother if you use supports.  I also set wall thickness to 1mm and added 100% infill just in case.  The orb is an 80mm diameter sphere with 2mm walls.  I think printing with white filament works better over a translucent filament as you can see in one of my example photos with Yellows or Blues that the white filament gives better glow.  You can also use colored filaments and white lights.  There are so many variants.  I would probably stay away from dark/black filaments if you want to light them.  My models pictured are only printed in white or translucent white with colored LEDs inside.  You might have to clean up the edges of the clasp just a little bit but it should snap together snugly.  Insert “balloon lights” in the orb ball and have fun!  I hope you enjoy it!