I acquired the following parts:

One N20 6VDC 30RPM gear motor.

One 3.7V 160mAh lithium polymer battery with suitable charger and mating connector with wires.

One 16" length of 2mm diameter metallic music wire (ferrous).

One 6mm diameter by 2.5mm thick neodymium magnet.

Nine 15mm diameter by 2.75mm thick neodymium magnets.

I 3D printed the following parts at .15mm layer height, 20% infill with no supports:

One "Base.stl".

One "Bottom.stl

One "Heart, Inner, Cover, I Love You.3mf" (dual extrusion).

One "Heart, Inner.stl".

One "Heart, Outer.stl".

One "Holder, Magnets.stl".

One "Top.stl".

I have also include the parts "Heart, Inner, Cover, I Love You Letters.stl" and "Heart, Inner, Cover, I Love You.stl" if you wish to print the cover on a single extrusion printer then glue the letters to the cover, and I've also included the part "Heart, Inner, Cover.stl" if you wish a blank cover to which you could leave blank, glue photos, apply stickers, or simply draw on.