Valentine Heart Pendant with LED

This is a small heart pendant for Valentines Day, with a flashing LED and battery for interest factor. It's meant to be a gift or personal fashion item. No soldering is required -- just 3D print, insert a LED and CR927 battery, and assemble (see the pictures in Post-Printing for details; note that strong finger pressure will be required to press the lid on, but it will fit and stay in place).
There are 2 variations of the design: "v1" has the strongest and most secure chain loop but won't l