This version of the dusk ball with magnetic clasp is based off of the models from the 6th gen 3DS games. For 5th gen see: http://www.thingiverse.com/thing:1081593
Print all the parts out. Print two of the Dusk_BlackShell_6thGen.stl you will need one for the lid and one for the bottom shell.
All the lid parts snap together really tightly so you wont need glue, usually.
After assembling the lid and the bottom you can glue the button and the ring to the bottom with the hinge in place as you glue the ring down. Then snap the hinge into the lid.
You will also need 2 magnets (1/4" X 1/16"). Just glue them in place.
Tip: Print your bottom piece at a higher in fill percentage, around 40-50% and then all the other parts at 5-10%. That way it will be bottom heavy and not roll around as much.
Every part I printed with 2 shells.
Top parts at low infill (5-10%). Bottom parts at high infill (40-50%) so it will be bottom heavy.
Most parts I did not use raft or supports except the Dusk_BlackShell_6thGen.stl I needed to use a raft and supports for that one. I also rotated the z-axis at 45 degrees so that the supports go diagonally across the overhangs, I found it easier to remove.