The only thing I changed from the "Master Ball, with magnetic clasp" was the lid again.
Print the four Lid files (You probably need supports on the Lid.stl and almost definitely on the Lid_Inner_Heart.stl file) After printing the parts you should be able to easily assemble the lid. From there glue the button into the button holder. Then glue the button assembly 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 need 2 magnets (1/4" X 1/16") and just glue them in place.
Note: Print off EasyLid.stl if you just want a quick Love Ball lid. It prints all in one piece with raised rim for the heart which serves as a guide for painting.
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.