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The 15-dollar, 15-minute Arc Reactor.

The 15-dollar, 15-minute Arc Reactor.
There are a bevy of good (some great), detailed, extensive Instructables showing you how to make a near-screen-accurate chest arc reactor for a Iron Man/Tony Stark costume.

I appreciate and enjoy all those but they can be a little time-consuming/expensive/requiring skills you may not have.

So I made this one for under $15 and in under 15 minutes. It's perfect if you need to throw together a costume but don't have a lot of time and/or money (or, in my case, craftsmanship skill).

Here's all you need:

1. A battery-powered, short string of blue LEDs (example: http://www.littlebrightlights.com/site/1435548/product/AC-100B). My string was Philips brand, 3 feet long (if I remember correctly) with 18 lights but really, any brand and any amount of lights under 20 would probably work just as well -- I got mine at Target for $8. Each of my individual lights are just about 1/2-inch long and 1/8th of an inch across. Try and find lights that are on a string of a shorter length, with as little space between bulbs as possible (this information should be on the box). The lights are the most important thing, not the length of the cord.

2. A hockey puck-shaped piece of white Styrofoam (1-inch thick, just under 3 inches in diameter). I got my piece by cutting the bottom off a conical piece of craft Styrofoam I already had. Packing Styrofoam will probably be too brittle to cut and it also has less opacity/reflectivity. I'd recommend using the lighter, craft Styrofoam that has the crystallized look and is made to be cut (Michaels is a good option).

3. A pen or marker.

4. A toothpick.

5. Tape (glue would work, too). I used 2-inch wide clear packing tape but any kind would probably work.
 
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Step 1Mark dots on styrofoam piece.

Mark dots on styrofoam piece.
However many lights are on your string, you should make that many marks on one (or both) sides of the Styrofoam piece (i.e., 18 lights = 18 marks). I used a Sharpie. It might help to practice on a piece of paper, first, to get the spacing down.

I made one in the center and then worked my way outwards. It doesn't need to be an exact science, just make it look presentable and in some semblance of a concentric circle or two. The lights will be so bright that most people generally won't want to stare at it long enough to count whether or not there are an equal amount of lights in each quadrant.
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41 comments
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Feb 9, 2012. 10:57 PMmissmaggy2u says:
One question. When you hang it over your shoulder, how does it stay in the center of your chest?
Jan 22, 2012. 2:27 PMmhkazemi says:
that is good idia
reality good
you can develop it
think about!!!
ok?
Nov 3, 2011. 9:09 PMcarellano1 says:
Loved this instructable and did my own. Could only find a 10 led string so my arc reactor looks more like the prototype he first made in the 1st movie. The cord was too short though so i cut it and and soldered longer wire to the battery pack so i can put it in my pocket. Used the leftover wire to hang it around my neck. Lemme know what you guys think :)

http://img.photobucket.com/albums/v330/Helgaiden/goodshot.jpg
http://img.photobucket.com/albums/v330/Helgaiden/DTR.jpg
http://img.photobucket.com/albums/v330/Helgaiden/dakr2.jpg
http://img.photobucket.com/albums/v330/Helgaiden/dark.jpg
Jan 10, 2012. 11:49 AMkunfumaster says:
hey man thats awsome!
Oct 20, 2011. 8:42 PMdominicgrz13 says:
Hey Justin I have a question, I don't know if its because you made this a year ago, but i could not find the right lights that you used from target also would the lights from (http://www.littlebrightlights.com/site/1435548/product/AC-100B ) work just as good without me having to change the size of the foam circle?

And finally, what color lights would be more noticeable under a suit?

I'm going to be Tony Stark :D
Oct 21, 2011. 7:06 PMdominicgrz13 says:
Oh, OK cool thanks bro.
Sep 15, 2011. 9:56 PMJacSpark says:
Would it be possible to use the LED "throwies" idea? but just stick them inside the foam?
May 16, 2011. 7:50 AMtparikka says:
looks great
Dec 30, 2010. 12:22 PMacardboardllama says:
pretty cool brother
Oct 30, 2010. 9:01 PMDoctroid says:
There's a ton of arc reactor instructables but this is the one I was most inspired by. I decided to do it Wednesday night, bought the materials and made it on Thursday, and wore it on Saturday. Being short on time (at the same time I was scrambling to finish up my son's bounty hunter costume), the simple behind-the-shirt approach seemed the way to go.

I did it differently though. I used a plastic jar lid with holes poked in it, covered with clear plastic with wax paper behind it to diffuse the light some, and with electrical tape in a circular grid over that to make the light pattern more like what was in the movie. I used 12 lights -- 10 in a circle on the outside and 2 in the center. (I cut the others off. Turns out with the LED strings sold at Target you can cut off an even number of lights and have the rest still work -- if you cut off an odd number, the last remaining one won't light up.)

For clothes I wore an a-shirt, a brown military shirt, and a military style cap, all reasonable approximations to things Stark wore in the cave in Afghanistan in the movie though not in that particular combination. I hot glued string to the arc reactor to suspend it from my neck and secure it around my chest, with the batteries inside my waistband. Worked pretty well and was easy to put together.

The arc reactor is too low on my body in the picture, I know -- as soon as I saw it on the camera screen, I went and re-adjusted it higher!
Oct 26, 2010. 2:14 PMsmallstrangegod says:
I just wanted to thank you! I just made this. It was so easy. It looks great and my boyfriend is going to love it! :) you saved our Halloween! I used LED micro lights from Target. They were 5.99 and they're battery operated. The foam discs I bought at the dollar store in the fake flower section. YAY! :)
May 6, 2010. 9:40 PMGreen_Primus says:
Not to rain on the "simple-parade" but wouldn't a dollar store round closet led disk work just as well?  they compress in the middle and light up (so all you see under the shirt is light)  and the back is adhesive (if you're into that, my chest hair isn't so much)   I used this exact set up for the 1st movie and it work out perfectly...just putting this out there.
Oct 17, 2010. 12:08 AManibioman says:
i did that but i taped some of it of so it had the arc reastor pattern of light
May 9, 2010. 4:52 AMBurnsides says:
 Where does one purchase the lights needed for this? What section of the store would these be in?
May 9, 2010. 4:18 PMBurnsides says:
 Ok, thanks!
Apr 7, 2009. 3:14 PMandrewreases says:
sorry dude but the arc reactor lights are like a wheel with lines going through it with a circle in the center
Feb 26, 2010. 2:14 PMApollo707 says:
i agree on the hand grenade policy ;)
the others are prettier but couldn`t be done in the short time frame
i think it looks just fine for the application
Feb 26, 2010. 6:07 PMApollo707 says:
thank you ladies and germs, don`t applaud, throw money ;)

May 6, 2010. 7:47 PMxtremd says:
 Awww. You don't except credit cards?

Phooey.
May 18, 2009. 6:59 PMmg0930mg says:
LMAO!
May 6, 2010. 4:55 PMcprocjr says:
 Not as realistic looking as it cool be, but good enough to work! 
I thought about making some of the other (more complex/accurate) ones, but I didn't want to spend the time. I might actually make this one! I just need to find some light...
Jan 22, 2010. 3:07 PMXWXAXDXEX says:
AWESOME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I'll get right to it.
Sep 19, 2009. 9:45 AMitak365 says:
That's a pretty awesome jacket, by the way. Good job with the arc reactor
Apr 8, 2009. 4:34 AMandrewreases says:
have you heard of indy mogul justin
Mar 28, 2009. 6:04 PMboogyheadabc says:
Have have you ever thought of connecting the styrofoam to some invisible string, hanging it from your neck and puting it in your pocket? Then you could put the battery in your pocket w/ a jacket on or, put it in an inside jacket pocket.
Mar 29, 2009. 5:50 PMboogyheadabc says:
Also what did you use for the battery? I don't see that on here and it could help me :D. Plz add that
Mar 31, 2009. 6:15 PMboogyheadabc says:
okay and did you use some wire to connect the two things together?
1-40 of 41next »

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Author:JustinBrown