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!
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
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)
Step 2: Oil the Platform
Step 3: Layer, Cool, Layer, Cool, Repeat!
If you're feeling impatient you can squirt it with water to cool it faster, as it will take 20~30+ layers to finish. I started by making a smaller heart, and then adding another layer of layers, which made it much smoother and big enough to hide the CR2032.
Step 4: Smoothing and Final Touches
Now the Heart is done. Time for the electronics!
Step 5: Solder and Embed the LED
Embed the LED in the heart by melting a small hole with the glue gun. Tape the extra long bare section of the negative wire to the CR2032, then glue the electrical tape to the heart to secure the battery.
Step 6: Wear It!
Now hold the larger magnet inside your shirt, and put the heart, with the small magnet attached to it, on the outside. Now it should stay put. To turn it off, just pull the broach off the small magnet.
Congratulations! You now have your own Wearable Illuminated Heart with which to impress yourself, your sweetheart, or some other worthy party. Thanks for reading!