A simple music box, Movements are cheap and easy to get. It takes the Sankyo style 18 note movements. Has provision for a 20mm long 3mm Allen head screw, that and a spring from a ball point pen, it can operate automatic when lid is opened.
1.75mm filament for hinge.
(2) 6x1.5mm Disk Magnet to hold lid shut.
The feet glue on so you dont have to print with a lot of supports.
Only supports needed is where the screw guide is on the box.
Box lid is plain, We had customized the one i took pictures of.