Summary

So a friend of mine did an Iron Man corset and it came out stunning. now she is doing another one and needed a glowing heart so here it is.
It does come with attachment points.

Instructions

So i printed it with the Front up so you don't see the support material which made the removal of the support a bit tricky since its recessed.
I used 4-7MCD LEDs white glowing red. There are 13 placements for them and I used them in groups of 3 with a 68Ohm resistor. The last group had 2 LEDs facing the person wearing it to give it an under glow. I used hot glue as both to insulate the various electrical connections and to keep the wires in place.
The 9V battery lasts a long time without having the unit overheat.

LED Heart