Picture of Wearable 3D glowing heart!
In this instructable, I'll show you how to make a charming three-dimensional broach in the shape of a heart, lit from the inside by an LED.  If broaches aren't your thing, you can also take the heart and put it on a card, on the top of a gift box, on a necklace, or in many other useful locations. A handy magnetic attachment system lets you snap it on and off with ease.

I don't have a 3D printer but I wanted to have a go at constructive plastic fabricating.  And, since my brother doesn't have girlfriend (and probably wouldn't want one), I thought someone should make him something nice for valentines day -- a 3D glowing heart, for example.

The heart is is made from (carefully) extruded hot glue, and it has a SMC LED powered by a CR2032. I was going to use a normal broach pin, but I have had some painful encounters with that species so I decided to use a small Neodymium magnet. Conveniently, the magnet also acts as a switch, clamping the power wire onto the battery.

This is my entry for the Valentines Day contest, so if you like it please Vote!

Step 1:

Picture of
Materials, tools, and supplies:

Glue sticks (1~2)
1 CR2032 (I got mine on ebay, $4 for 100 +$5 for shipping to Canada, a total of $10.15 for 100)
1 SMC red LED
1 tiny (super flat) neodymium magnet
1 medium size (1/2" by 1/8~1/16th" approx) neodymium magnet
1 small piece of wire

Soldering iron
Glue gun

Cool, smooth surface for the extruding platform (I used a computer power supply case)
Oil (1 teaspoon)

Helping hands soldering helper
Water in a squirt bottle (for cooling)

BobyF11 months ago

Will this work with regular leds?

lonenome3 years ago
thanks for the idea took me a little bit but i made one. I believe i made mine a bit big the LED did not light it up as well. Also i did not do any soldering i bent the LED leads to wrap around the battery and used glue to hold it in place. I love the idea about the magnet i used it and it worked perfect. I plan on making a few more lets see how they turn out.
cc673 years ago
Isn't it that the magnet would destroy the battery? If not so, I would try making this. tnx for this instructable
circuitbreaker (author)  cc673 years ago
I do not think so.

As far as I know CR2032's are made from a thin piece of metallic lithium as the negative electrode, a porous separator, and manganese dioxide as the positive electrode. I do not see how a magnet could damage it, and, I have run mine off the same battery for long periods of time without any issues.

I found a photo of a disassembled 2032 here: http://en.wikipedia.org/wiki/Lithium_battery

Hope this helps,

tnx. I was afraid of doing this because I heard some batteries explode when exposed to strong magnetism
kmbrmom4 years ago
Love the idea of using hot glue—I actually have it on hand, as opposed to various malleable plastics I was considering ordering. The hot glue seems to diffuse really well, too!

The illustrations are really complete. Thanks for the instructable!
blodefood5 years ago
Oh so Canadian "...with glowing hearts, we see thee rise ..." and oh so practical. Pins are passé.  No clothes are damaged in the wearing of this heart. 
imrobot5 years ago
Jur5 years ago
Wow, I'm impressed with how well that small LED manages to light up the entire heart!
Nice idea and well documented, I like =)